Science

the-world’s-most-traveled-crew-transport-spacecraft-flies-again

The world’s most-traveled crew transport spacecraft flies again

commercial crew, Commercial space, crew dragon, Crew-8, falcon 9, human spaceflight, international space station, launch, NASA, Science, Space / /
A SpaceX Falcon 9 rocket lifts off with the Crew-8 mission, sending three NASA astronauts and one Russian cosmonaut on a six-month expedition on the International Space Station.

Enlarge / A SpaceX Falcon 9 rocket lifts off with the Crew-8 mission, sending three NASA astronauts and one Russian cosmonaut on a six-month expedition on the International Space Station.

SpaceX’s oldest Crew Dragon spacecraft launched Sunday night on its fifth mission to the International Space Station, and engineers are crunching data to see if the fleet of Dragons can safely fly as many as 15 times.

It has been five years since SpaceX launched the first Crew Dragon spacecraft on an unpiloted test flight to the space station and nearly four years since SpaceX’s first astronaut mission took off in May 2020. Since then, SpaceX has put its clan of Dragons to use ferrying astronauts and cargo to and from low-Earth orbit.

Now, it’s already time to talk about extending the life of the Dragon spaceships. SpaceX and NASA, which shared the cost of developing the Crew Dragon, initially certified each capsule for five flights. Crew Dragon Endeavour, the first in the Dragon fleet to carry astronauts, is now flying for the fifth time.

This ship has spent 466 days in orbit, longer than any spacecraft designed to transport people to and from Earth. It will add roughly 180 days to its flight log with this mission.

Crew Dragon Endeavour lifted off from Florida aboard a Falcon 9 rocket at 10: 53 pm EST Sunday (03: 53 UTC Monday), following a three-day delay due to poor weather conditions across the Atlantic Ocean, where the capsule would ditch into the sea in the event of a rocket failure during the climb into orbit.

Commander Matthew Dominick, pilot Michael Barratt, mission specialist Jeanette Epps, and Russian cosmonaut Alexander Grebenkin put on their SpaceX pressure suits and strapped into their seats inside Crew Dragon Endeavour Sunday evening at NASA’s Kennedy Space Center. SpaceX loaded liquid propellants into the rocket, while ground teams spent the final hour of the countdown evaluating a small crack discovered on Dragon’s side hatch seal. Managers ultimately cleared the spacecraft for launch after considering whether the crack could pose a safety threat during reentry at the end of the mission.

“We are confident that we understand the issue and can still fly the whole mission safely,” a member of SpaceX’s mission control team told the crew inside Dragon.

This mission, known as Crew-8, launched on a brand-new Falcon 9 booster, which returned to landing a few minutes after liftoff at Cape Canaveral Space Force Station. The Falcon 9’s upper stage released the Dragon spacecraft into orbit about 12 minutes after liftoff. The four-person crew will dock at the space station around 3 am EST (0800 UTC) Tuesday.

Crew-8 will replace the four-person Crew-7 team that has been at the space station since last August. Crew-7 will return to Earth in about one week on SpaceX’s Crew Dragon Endurance spacecraft, which is flying in space for the third time.

The Crew-8 mission came home for a reentry and splashdown off the coast of Florida in late August of this year, wrapping up Crew Dragon Endeavour’s fifth trip to space. This is the current life limit for a Crew Dragon spacecraft, but don’t count out Endeavour just yet.

Fleet management

“Right now, we’re certified for five flights on Dragon, and we’re looking at extending that life out,” said Steve Stich, NASA’s commercial crew program manager. “I think the goal would be for SpaceX to say 15 flights of Dragon. We may not get there in every single system.”

One by one, engineers at SpaceX and NASA are looking at Dragon’s structural skeleton, composite shells, rocket engines, valves, and other components to see how much life is left in them. Some parts of the spacecraft slowly fatigue from the stresses of each launch, reentry, and splashdown, along with the extreme temperature swings the capsule sees thousands of times in orbit. Each Draco thruster on the spacecraft is certified for a certain number of firings.

Some components are already approved for 15 flights, Stich said in a recent press conference. “Some, we’re still in the middle of working on,” he said. “Some of those components have to go through some re-qualification to make sure that they can make it out to 15 flights.”

Re-qualifying a component on a spacecraft typically involves putting hardware through extensive testing on the ground. Because SpaceX reuses hardware, engineers can remove a part from a flown Dragon spacecraft and put it through qualification testing. NASA will get the final say in certifying the Dragon spacecraft for additional flights because the agency is SpaceX’s primary customer for crew missions.

The Dragon fleet is flying more often than SpaceX or NASA originally anticipated. The main reason for this is that Boeing, NASA’s other commercial crew contractor, is running about four years behind SpaceX in getting to its first astronaut launch on the Starliner spacecraft.

When NASA selected SpaceX and Boeing for multibillion-dollar commercial crew contracts in 2014, the agency envisioned alternating between Crew Dragon and Starliner flights every six months to rotate four-person crews at the International Space Station. With Boeing’s delays, SpaceX has picked up the slack.

The world’s most-traveled crew transport spacecraft flies again Read More »

how-melting-arctic-ice-leads-to-european-drought-and-heatwaves

How melting Arctic ice leads to European drought and heatwaves

climate change, Greenland, ice melt, North Atlantic, Science, syndication / /

the big melt —

Fresh, cold water from Greenland ice melting upsets North Atlantic currents.

–

The Wamme river is seen at a low level during the European heatwave on Aug 10, 2022 in Rochefort, Belgium.

Enlarge / The Wamme river is seen at a low level during the European heatwave on Aug 10, 2022 in Rochefort, Belgium.

Thierry Monasse/Getty Images

The Arctic Ocean is mostly enclosed by the coldest parts of the Northern Hemisphere’s continents, ringed in by Siberia, Alaska and the Canadian Arctic, with only a small opening to the Pacific through the Bering Strait, and some narrow channels through the labyrinth of Canada’s Arctic archipelago.

But east of Greenland, there’s a stretch of open water about 1,300 miles across where the Arctic can pour its icy heart out to the North Atlantic. Those flows include increasing surges of cold and fresh water from melted ice, and a new study in the journal Weather and Climate Dynamics shows how those pulses can set off a chain reaction from the ocean to the atmosphere that ends up causing summer heatwaves and droughts in Europe.

The large new inflows of fresh water from melting ice are a relatively new ingredient to the North Atlantic weather cauldron, and based on measurements from the new study, a currently emerging “freshwater anomaly” will likely trigger a drought and heatwave this summer in Southern Europe, said the study’s lead author, Marilena Oltmanns, an oceanographer with the United Kingdom’s National Oceanography Centre.

She said warmth over Greenland in the summer of 2023 melted a lot of ice, sending more freshwater toward the North Atlantic. Depending on the exact path of the influx, the findings suggest that, in addition to the immediate impacts this year, it will also trigger a heatwave and drought in Northern Europe in a more delayed reaction in the next five years, she said.

The coming extremes will probably be similar to the European heatwaves of 2018 and 2022, she added, when there were huge temperature spikes in the Scandinavian and Siberian Arctic, as well as unusual wildfires in far northern Sweden. That year, much of the Northern Hemisphere was scorched, with “22 percent of populated and agricultural areas simultaneously experiencing heat extremes between May and July,” according to a 2019 study in Nature.

In 2022, persistent heat waves across Europe from May to August killed more than 60,000 people, subsequent research showed. The United Kingdom reported its first-ever 40° Celsius (104° Fahrenheit) reading that summer, and the European Union’s second-worst wildfire season on record burned about 3,500 square miles of land.

Meanwhile, 2022 was also Europe’s driest year on record, with 63 percent of its rivers showing below-average discharge and low flows hampering important river shipping channels as well as power production.

The Combined Drought Indicator—used to identify areas affected by agricultural drought, and areas with the potential to be affected—estimated for the first 10 days of each month from April to September 2022.

Enlarge / The Combined Drought Indicator—used to identify areas affected by agricultural drought, and areas with the potential to be affected—estimated for the first 10 days of each month from April to September 2022.

European Commission, Joint Research Centre

Oltmanns said the findings will help farmers, industries, and communities to plan ahead for specific weather conditions by developing more resilient agricultural methods, predicting fuel demand and preparing for wildfires.

Changing effects of freshwater flows into the North Atlantic had previously been observed over decadal timescales, associated with cyclical, linked shifts of ocean currents and winds, but that was “a very low frequency signal,” she said. “We have disentangled the signals.”

Now the fluctuations are more frequent and more intense, “switching between different states very rapidly,” she said, adding that the study shows how the ocean changes driven by freshwater inflows have “direct and immediate consequences on the atmospheric circulation,” and thus on subsequent weather patterns in Europe.

How melting Arctic ice leads to European drought and heatwaves Read More »

cdc-ditches-5-day-covid-isolation,-argues-covid-is-becoming-flu-like

CDC ditches 5-day COVID isolation, argues COVID is becoming flu-like

5-day isolation, CDC, COVID-19, COVID-19 vaccination, flu shots, health, infectious idease, influenza, isolation, respiratory virus, RSV, Science, vaccines / /

New phase —

The agency released a unified “practical” guidance for respiratory viruses.

–

A view of the Centers for Disease Control and Prevention headquarters in Atlanta.

Enlarge / A view of the Centers for Disease Control and Prevention headquarters in Atlanta.

COVID-19 is becoming more like the flu and, as such, no longer requires its own virus-specific health rules, the Centers for Disease Control and Prevention said Friday alongside the release of a unified “respiratory virus guide.”

In a lengthy background document, the agency laid out its rationale for consolidating COVID-19 guidance into general guidance for respiratory viruses—including influenza, RSV, adenoviruses, rhinoviruses, enteroviruses, and others, though specifically not measles. The agency also noted the guidance does not apply to health care settings and outbreak scenarios.

“COVID-19 remains an important public health threat, but it is no longer the emergency that it once was, and its health impacts increasingly resemble those of other respiratory viral illnesses, including influenza and RSV,” the agency wrote.

The most notable change in the new guidance is the previously reported decision to no longer recommend a minimum five-day isolation period for those infected with the pandemic coronavirus, SARS-CoV-2. Instead, the new isolation guidance is based on symptoms, which matches long-standing isolation guidance for other respiratory viruses, including influenza.

“The updated Respiratory Virus Guidance recommends people with respiratory virus symptoms that are not better explained by another cause stay home and away from others until at least 24 hours after both resolution of fever AND overall symptom are getting better,” the document states. “This recommendation addresses the period of greatest infectiousness and highest viral load for most people, which is typically in the first few days of illness and when symptoms, including fever, are worst.”

“Residual risk”

The CDC acknowledged that the eased isolation guidance will create “residual risk of SARS-CoV-2 transmission,” and that most people are no longer infectious only after 8 to 10 days. As such, the agency urged people to follow additional interventions—including masking, testing, distancing, hygiene, and improving air quality—for five additional days after their isolation period.

“Today’s announcement reflects the progress we have made in protecting against severe illness from COVID-19,” CDC Director Dr. Mandy Cohen said in a statement. “However, we still must use the commonsense solutions we know work to protect ourselves and others from serious illness from respiratory viruses—this includes vaccination, treatment, and staying home when we get sick.”

Overall, the agency argued that a shorter isolation period would be inconsequential. Other countries and states that have similarly abandoned fixed isolation times did not see jumps in COVID-19 emergency department visits or hospitalizations, the CDC pointed out. And most people who have COVID-19 don’t know they have it anyway, making COVID-19-specific guidance moot, the agency argued. In a recent CDC survey, less than half of people said they would test for SARS-CoV-2 if they had a cough or cold symptoms, and less than 10 percent said they would go to a pharmacy or health care provider to get tested. Meanwhile, “The overall sensitivity of COVID-19 antigen tests is relatively low and even lower in individuals with only mild symptoms,” the agency said.

The CDC also raised practical concerns for isolation, including a lack of paid sick leave for many, social isolation, and “societal costs.”

The points are likely to land poorly with critics.

“The CDC is again prioritizing short-term business interests over our health by caving to employer pressure on COVID guidelines. This is a pattern we’ve seen throughout the pandemic,” Lara Jirmanus, Clinical Instructor of Medicine at Harvard Medical School, said in a press release last month after the news first broke of the CDC’s planned isolation update. Jirmanus is a member of the People’s CDC, a group that advocates for more aggressive COVID-19 policies, which put out the press release.

Another member of the group, Sam Friedman, a professor of population health at NYU Grossman School of Medicine, also blasted the CDC’s stance last month. The guidance will “make workplaces and public spaces even more unsafe for everyone, particularly for people who are high-risk for COVID complications,” he said.

COVID and flu

But, the CDC argues that the threat of COVID-19 is fading. Hospitalizations, deaths, prevalence of long COVID, and COVID-19 complications in children (MIS-C) are all down. COVID-19 vaccines are safe and effective at preventing severe disease, death, and to some extent, long COVID—we just need more people to get them. Over 95 percent of adults hospitalized with COVID-19 in the 2023–2024 respiratory season had no record of receiving the seasonal booster dose, the agency noted. Only 22 percent of adults got the latest shot, including only 42 percent of people ages 65 and older. In contrast, 48 percent of adults got the latest flu shot, including 73 percent of people ages 65 and older.

But even with the crummy vaccination rates for COVID-19, a mix of past infection and shots have led to a substantial protection in the overall population. The CDC even went as far as arguing that COVID-19 deaths have fallen to a level that is similar to what’s seen with flu.

“Reported deaths involving COVID-19 are several-fold greater than those reported to involve influenza and RSV. However, influenza and likely RSV are often underreported as causes of death,” the CDC said. In the 2022–2023 respiratory virus season, there were nearly 90,000 reported COVID-19 deaths. For flu, there were 9,559 reported deaths, but the CDC estimates the true number to be between 18,000 and 97,000. In the current season, there have been 32,949 reported COVID-19 deaths to date and 5,854 reported flu deaths, but the agency estimates the real flu deaths are between 17,000 and 50,000.

“Total COVID-19 deaths, accounting for underreporting, are likely to be higher than, but of the same order of magnitude as, total influenza deaths,” the agency concluded.

In all, the CDC was ready to fold SARS-CoV-2 into the gang of common seasonal respiratory viruses, with most cases mild and undiagnosed. “Viruses cause most acute respiratory illnesses, but it is rarely possible to determine the type of virus without testing, and oftentimes testing does not change clinical management,” the agency wrote.

CDC ditches 5-day COVID isolation, argues COVID is becoming flu-like Read More »

daily-telescope:-two-nebulae-in-orion-for-the-price-of-one

Daily Telescope: Two nebulae in Orion for the price of one

daily telescope, Science, Space / /

A dark nebula —

What happens if you observe the same patch of sky every night all winter?

–

The Flame and Horsehead nebulae in Orion.

Enlarge / The Flame and Horsehead nebulae in Orion.

Andrew Desrosiers

Welcome to the Daily Telescope. There is a little too much darkness in this world and not enough light, a little too much pseudoscience and not enough science. We’ll let other publications offer you a daily horoscope. At Ars Technica, we’re going to take a different route, finding inspiration from very real images of a universe that is filled with stars and wonder.

Good morning. It’s March 1, and today’s image showcases two nebulae within the Orion constellation.

On the left of the image you can see the Flame Nebula, named as such because it’s an emoticon often used in gaming chats—just kidding. Rather, it’s an emission nebula about 1,000 light-years from Earth. To the right of the image is the rather iconic Horsehead Nebula, which really does resemble the head of a horse. It’s a little less than 1,400 light-years from Earth. The darkness in the nebula is mostly due to thick dust blocking the light of the stars behind it.

Andrew Desrosiers sent in this image, which he took from his home in Ashby, Massachusetts. It’s the product of about 60 hours of observing the same location of the night sky.

“This is part of a project I started early this winter to keep my telescope just trained on this part of the sky all winter,” he told me. “So far I have captured 60 hours of exposure data.” He hopes to get to 100 before the end of the season.

Source: Andrew Desrosiers

Do you want to submit a photo for the Daily Telescope? Reach out and say hello.

Daily Telescope: Two nebulae in Orion for the price of one Read More »

rocket-report:-astra-warns-of-“imminent”-bankruptcy;-falcon-heavy-launch-delay

Rocket Report: Astra warns of “imminent” bankruptcy; Falcon Heavy launch delay

rocket report, Science, Space / /
Static fire test of the Falcon 9 rocket that will launch the Crew 8 mission in early March.

Enlarge / Static fire test of the Falcon 9 rocket that will launch the Crew 8 mission in early March.

SpaceX

Welcome to Edition 6.33 of the Rocket Report! If you check the “next three launches” list below you’ll see that all three are for Falcon 9 rockets. That’s not the first time this has happened this year, nor will it likely be the last. It’s starting to look like SpaceX might actually come close to its target of 150 launches this year—a remarkable cadence.

As always, we welcome reader submissions, and if you don’t want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets, as well as a quick look ahead at the next three launches on the calendar.

India building a second spaceport. The Indian Space Research Organisation, ISRO, has received the go-ahead to construct a new spaceport in Tamil Nadu, with which it aims to help private players launch small rockets, Tech Crunch reports. On Wednesday, Prime Minister Narendra Modi laid the foundation stone for the spaceport, located on an island named Kulasekharapatnam off the southern state of Tamil Nadu. This will be the country’s second spaceport after the space agency’s existing Satish Dhawan Space Centre.

Easier path to the poles … The spaceport will be dedicated to launching smaller launch vehicles and will be ready in about two years. Spread over 2,350 acres, the Kulasekharapatnam spaceport will help save propellant for small rocket launches, as the port can launch rockets directly south over the Indian Ocean without requiring crossing landmasses. This is unlike the existing launch site at the Satish Dhawan Space Centre, which adds more fuel requirement for launching into a polar orbit as rockets need to follow a curved path to the south to avoid Sri Lanka’s landmass. (submitted by Joey S-IVB)

Astra founders warn of “imminent bankruptcy.” The founders of satellite propulsion and launch vehicle company Astra have sharply cut their offer to take the company private, warning of “imminent bankruptcy” if the company doesn’t accept their new proposal, Space News reports. In a US Securities and Exchange Commission filing on Tuesday, Astra released a letter sent three days earlier to a special committee of the company’s board of directors from Chris Kemp and Adam London, the chief executive and chief technology officer, slashing by two-thirds their offer to buy outstanding shares of the publicly traded company.

Pray I don’t alter it further … In November, Kemp and London proposed to buy Astra shares at $1.50, approximately double their price at the time they announced the deal. In the new proposal, they are offering only $0.50 per share. Kemp and London cited several reasons for cutting the share price. They included continued cash burn by the company since they tendered the original offer and higher “non-operating expenses” as the company used multiple third-party advisers to assess options. Under the revised proposal, Kemp and London said they anticipated raising $45 million overall to take Astra private, of which $7.7 million would go to shareholders. (submitted by Ken the Bin)

The easiest way to keep up with Eric Berger’s space reporting is to sign up for his newsletter, we’ll collect his stories in your inbox.

RFA reveals plans for SaxaVord spaceport. An environmental report published by the UK Civil Aviation Authority has provided greater insight into Rocket Factory Augsburg’s proposed operations at SaxaVord Spaceport in Scotland, European Spaceflight reports. The report details a plan for RFA to conduct up to 10 launches per year from SaxaVord, which would account for one-third of the spaceport’s total budget of 30 orbital launches per year.

More engines, please … Because of the local bird population, RFA will be unable to conduct launches or static fire tests between mid-May and the end of June. The company will also be limited to a maximum of two launches per month. The rocket’s design is also changing. Significantly, the 21-meter first stage will now be equipped with 13 Helix engines producing 1,300 kilonewtons of thrust instead of just nine engines, as previously stated by the company. (submitted by Ken the Bin)

Rocket Report: Astra warns of “imminent” bankruptcy; Falcon Heavy launch delay Read More »

for-virgin-galactic,-becoming-profitable-means-a-pause-in-flying-to-space

For Virgin Galactic, becoming profitable means a pause in flying to space

Commercial space, human spaceflight, Science, Space, Spaceport America, suborbital space, Virgin Galactic / /
Virgin Galactic's VSS <em>Unity</em> rocket plane ignites its rocket motor moments after release from a jet-powered carrier aircraft high above New Mexico.” src=”https://cdn.arstechnica.net/wp-content/uploads/2024/02/unity22release-800×922.jpeg”></img><figcaption> <p><a data-height=Enlarge / Virgin Galactic’s VSS Unity rocket plane ignites its rocket motor moments after release from a jet-powered carrier aircraft high above New Mexico.

Last year, Virgin Galactic seemed to finally be hitting a stride toward making commercial suborbital spaceflight. The company flew its SpaceShipTwo rocket plane to the edge of space six times in six months, giving a few Virgin Galactic customers a taste of spaceflight after waiting more than a decade.

Finally, it appeared that Virgin Galactic turned a corner, moving past the setbacks and course corrections that delayed founder Sir Richard Branson’s aim of bringing spaceflight to a wider population. Virgin Galactic officials wouldn’t describe the company’s next step as a setback or a course correction. It’s part of an intentional business strategy to make Branson’s dream a reality.

“That dream behind Virgin Galactic came into sharp focus as we repeatedly flew spaceship Unity in 2023,” said Michael Colglazier, Virgin Galactic’s president and CEO, in a quarterly earnings call this week. “Now, in 2024, we’re poised for even more meaningful accomplishments as we build the fleet of spaceships that will turn the dream into reality and long-term success.”

But to do so, Virgin Galactic needs to give up on the horse that got them here.

On 11 missions, including test flights, the VSS Unity rocket plane has soared higher than 50 miles (80 kilometers)—where space begins, according to the US government’s definition—but it will probably fly just once more. Virgin Galactic is redirecting resources toward completing the development and testing of a new fleet of rocket planes known as Delta-class ships, which the company says will outclass VSS Unity in flight cadence, reusability, and revenue-earning potential.

Colglazier said the first of Virgin Galactic’s Delta ships is on track to begin ground and flight testing next year, with commercial service targeted for 2026 based out of Spaceport America in New Mexico.

One more and done

Late last year, Virgin Galactic announced it would retire VSS Unity by the middle of 2024, following the company’s Galactic 07 or Galactic 08 missions. On Tuesday, a company spokesperson confirmed to Ars that Virgin Galactic will pause flights of VSS Unity after the Galactic 07 mission slated for this spring. That means the rocket plane will fly to space just one more time, taking four customers into suborbital space to experience a few minutes of microgravity before coming back to land on a runway.

Colglazier said this next flight will have a “blended manifest of researchers and private citizens.” The company hasn’t identified any of the passengers, and for the last several flights, hasn’t announced the names of its passengers until after they landed.

Mike Moses, Virgin Galactic’s president of spaceline operations, said the Galactic 07 mission, the final flight of VSS Unity, is scheduled for the second quarter of this year, sometime between the beginning of April and the end of June. He said engineers are looking at a “minor change” to a retention mechanism that malfunctioned on the Galactic 06 flight last month, causing an alignment pin to fall to the ground as the rocket plane separated from its carrier aircraft over New Mexico.

Virgin Galactic reported the anomaly earlier this month, but Moses said the alignment pin performed its function of keeping the VSS Unity spacecraft properly aligned to its carrier jet through pre-flight procedures until the rocket plane separated from the aircraft to fire its rocket motor and climb to the edge of space. The anomaly “posed no safety threat at all during the flight,” he said, but “clearly we don’t want it to fall.”

The reason for pulling VSS Unity off flight status boils down to money, not any technical limitation. In August, Moses told Ars that VSS Unity could be capable of 500 to 1,000 flights.

For Virgin Galactic, becoming profitable means a pause in flying to space Read More »

gastrointestinal-disease-explodes-in-ala.-elementary-school;-773-kids-out

Gastrointestinal disease explodes in Ala. elementary school; 773 kids out

Alabama, elementary school, gastrointestinal, health, Infectious disease, Norovirus, outbreak, school, Science, students / /

no, no, no —

Highly contagious norovirus is the leading suspect; four other area schools affected.

–

An electron micrograph of norovirus.

Enlarge / An electron micrograph of norovirus.

Officials in Alabama have shut down an elementary school for the rest of the week and are conducting a deep clean after 773 of the school’s 974 students were absent Wednesday amid an explosive outbreak of gastrointestinal illness.

Local media reported that only 29 students were absent from Fairhope West Elementary School on Tuesday. However, the situation escalated quickly on Wednesday as word spread of a stomach bug going around the Gulf Coast school. A spokesperson for the county school district told AL.com that 773 students and 50 staff were absent Wednesday. It’s unclear how many of the absences were due to sickness or precaution.

Health officials are now investigating the cause of the gastrointestinal outbreak, collecting specimens for testing. So far, officials are working under the assumption that it is norovirus, a highly infectious gastrointestinal bug that can survive hand sanitizer and transmit easily from surfaces, food, and water. The symptoms of the unidentified illness align with norovirus: vomiting, diarrhea, abdominal cramps, and nausea.

On Wednesday, Baldwin County Schools Superintendent Eddie Tyler sent a message to parents saying that the county had decided to shut the school down for the rest of the week. “Due to the amount of staff and students who are absent, the number who are experiencing symptoms, and in an effort to help contain the contagion, we unfortunately need to shut the building down,” Tyler wrote. “While out, we will be conducting a deep cleaning of the school so when students return next week, it will be sanitized to the fullest extent.”

But local outlet WKRG reported Thursday that the outbreak has already spread beyond Fairhope West. On Thursday, 1,231 students from four other area schools were also absent, including 721 students at Fairhope East Elementary School, 136 at a third elementary school, 170 at a middle school, and 204 at a high school. These are in addition to the 974 students at Fairhope West who are out of school while it is shut down.

Norovirus activity is high across the country, with the northeastern region seeing the largest surge, according to surveillance by the Centers for Disease Control and Prevention. The agency notes that outbreaks are commonly linked to health care settings, restaurants or catered events, cruise ships, as well as schools and childcare centers. “Close quarters, shared spaces, and high-touch surfaces make it easy for norovirus to spread in schools,” the CDC points out.

In 2022, the COVID-19 pandemic flipped the script on standard norovirus outbreaks. People who were hoping to avoid close contact and share indoor air with strangers headed to the great outdoors, which led to a large outbreak of norovirus in the Grand Canyon.

Gastrointestinal disease explodes in Ala. elementary school; 773 kids out Read More »

study-finds-link-between-marijuana-use-and-cardiovascular-disease

Study finds link between marijuana use and cardiovascular disease

cannibis, cardiovascular disease, health, heart attack, marijuana, Science, stroke / /

Association —

Researchers call for more studies to understand why they’re linked.

–

A cannabis flower is seen at East End Flower Farm, in Mattituck, New York, on November 16, 2023.

Enlarge / A cannabis flower is seen at East End Flower Farm, in Mattituck, New York, on November 16, 2023.

Survey data collected from more than 430,000 US adults over multiple years suggests a strong, statistically significant link between the use of cannabis and an increased risk of cardiovascular disease, specifically heart attack and stroke.

The open-access study, published this week in Journal of the American Heart Association, found that people who used cannabis every day had 25 percent higher odds of having a heart attack and 42 percent higher odds of having a stroke compared with those who did not use cannabis at all.

But, the national survey data—collected between 2016 and 2020—also contained data on people who used cannabis less frequently than daily. Survey respondents were asked how many days in the past 30 days they used cannabis, which allowed researchers to estimate the odds of cardiovascular disease along the whole spectrum of cannabis use. And they found near-linear dose-responses, with more days of use per month associated with higher risk.

This isn’t the first time that researchers have found an association between cannabis use and cardiovascular disease, but the study is among the largest to date—with a sample size between three and 17 times larger than previous studies. Its size not only added weight to the link but also allowed the researchers to drill down into other risk factors for cardiovascular disease.

Clear link

One common complicating factor is that people who use cannabis also often use tobacco products, which carry their own increased risk for cardiovascular disease. In the new study, led by Abra Jeffers of Massachusetts General Hospital, researchers were able to do two additional analyses: one that looked at cardiovascular disease risk in people who use cannabis but had never used tobacco products and a second one that looked at people who used cannabis but had never used tobacco products or e-cigarettes. Without tobacco use, the higher odds of heart attack and stroke persisted for people who used cannabis. For those without tobacco or e-cigarette use, only the higher odds of stroke remained.

The researchers also looked at age, another complicating factor. Heart disease can take years or decades to develop, but people who use cannabis tend to skew younger. The 434,104 people who took the survey ranged from age 18 to 74, and the analyses adjusted for other health factors, including alcohol use, diabetes, body mass index, and physical activity. When the researchers looked at just the adults who would be considered on the young side for developing cardiovascular disease (less than 55 for men and less than 65 for women), they found that cannabis use also increased the odds of premature cardiovascular disease—and again the link was independent of tobacco and e-cigarette use.

In all, the researchers concluded that “these data suggest that cannabis use may be a risk factor for cardiovascular disease and may be a risk factor for premature cardiovascular disease,” they wrote. This is particularly concerning, they add, because of the growing acceptance and use of cannabis in the US and a decline in perceived health risks.

Limitations

But, the study has limitations that preclude a firm conclusion that cannabis is causing cardiovascular disease. The study relies on self-reported data on both cardiovascular health and cannabis use—both of which can be unreliable. It also relied on data collected at a specific point in time. It’s possible that some people turned to cannabis use after developing cardiovascular disease rather than before, for instance. The survey data can’t make that distinction; it’s only making an association. The authors note that cardiovascular disease, heart attack, and stroke have not previously been identified as major reasons that people use cannabis. This lessens the reverse concern that cardiovascular disease is increasing the odds of cannabis use. But, the researchers do note that many studies have linked the use of cannabis to chronic pain, insomnia, and anxiety—all of which have also been associated with cardiovascular disease. Last, the survey data does not include data on people’s actual cardiovascular health, such as blood pressure and lipid profiles.

Another wrinkle to the study is the route of cannabis use and how it may play a role in the link to cardiovascular disease. About 74 percent of cannabis users in the study reported smoking cannabis, which could potentially increase the risk of cardiovascular disease much the same way tobacco cigarettes do—a result of inhaling particulate matter into the lungs. It’s unclear if edible cannabis products would weaken the association seen in the study.

But, the authors note that there is a biologically plausible link between cannabis and cardiovascular disease. Cell signaling receptors that detect components of cannabis (endocannabinoid receptors) are ubiquitous throughout the cardiovascular system, the researchers note. And the key psychoactive substance in cannabis, Tetrahydrocannabinol (THC), can increase blood pressure and heart rate during use.

Study finds link between marijuana use and cardiovascular disease Read More »

a-big-boost-to-europe’s-climate-change-goals

A big boost to Europe’s climate-change goals

climate change, Policy, Science, syndication / /

carbon-neutral continent —

A new policy called CBAM will assist Europe’s ambition to become carbon-neutral.

–

Steelworker starting molten steel pour in steelworks facility.

Enlarge / Materials such as steel, cement, aluminum, electricity, fertilizer, hydrogen, and iron will soon be subject to greenhouse gas emissions fees when imported into Europe.

Monty Rakusen/Getty

The year 2023 was a big one for climate news, from record heat to world leaders finally calling for a transition away from fossil fuels. In a lesser-known milestone, it was also the year the European Union soft-launched an ambitious new initiative that could supercharge its climate policies.

Wrapped in arcane language studded with many a “thereof,” “whereas” and “having regard to” is a policy that could not only help fund the European Union’s pledge to become the world’s first carbon-neutral continent, but also push industries all over the world to cut their carbon emissions.

It’s the establishment of a carbon price that will force many heavy industries to pay for each ton of carbon dioxide, or equivalent emissions of other greenhouse gases, that they emit. But what makes this fee revolutionary is that it will apply to emissions that don’t happen on European soil. The EU already puts a price on many of the emissions created by European firms; now, through the new Carbon Border Adjustment Mechanism, or CBAM, the bloc will charge companies that import the targeted products—cement, aluminum, electricity, fertilizer, hydrogen, iron, and steel—into the EU, no matter where in the world those products are made.

These industries are often large and stubborn sources of greenhouse gas emissions, and addressing them is key in the fight against climate change, says Aaron Cosbey, an economist at the International Institute for Sustainable Development, an environmental think tank. If those companies want to continue doing business with European firms, they’ll have to clean up or pay a fee. That creates an incentive for companies worldwide to reduce emissions.

In CBAM’s first phase, which started in October 2023, companies importing those materials into the EU must report on the greenhouse gas emissions involved in making the products. Beginning in 2026, they’ll have to pay a tariff.

Even having to supply emissions data will be a big step for some producers and could provide valuable data for climate researchers and policymakers, says Cosbey.

“I don’t know how many times I’ve gone through this exercise of trying to identify, at a product level, the greenhouse gas intensity of exports from particular countries and had to go through the most amazing, torturous processes to try to do those estimates,” he says. “And now it’s going to be served to me on a plate.”

CBAM will apply to a set of products that are linked to heavy greenhouse gas emissions.

Enlarge / CBAM will apply to a set of products that are linked to heavy greenhouse gas emissions.

Side benefits at home

While this new carbon price targets companies abroad, it will also help the EU to pursue its climate ambitions at home. For one thing, the extra revenues could go toward financing climate-friendly projects and promising new technologies.

But it also allows the EU to tighten up on domestic pollution. Since 2005, the EU has set a maximum, or cap, on the emissions created by a range of industrial “installations” such as oil and metal refineries. It makes companies within the bloc use credits, or allowances, for each ton of carbon dioxide—or equivalent discharges of other greenhouse gases—that they emit, up to that cap. Some allowances are currently granted for free, but others are bought at auction or traded with other companies in a system known as a carbon market.

But this idea—of making it expensive to harm the planet—creates a conundrum. If doing business in Europe becomes too expensive, European industry could flee the continent for countries that don’t have such high fees or strict regulations. That would damage the European economy and do nothing to solve the environmental crisis. The greenhouse gases would still be emitted—perhaps more than if the products had been made in Europe—and climate change would careen forward on its destructive path.

The Carbon Border Adjustment Mechanism aims to impose the same carbon price for products made abroad as domestic producers must pay under the EU’s system. In theory, that keeps European businesses competitive with imports from international rivals. It also addresses environmental concerns by nudging companies overseas toward reducing greenhouse gas emissions rather than carrying on as usual.

This means the EU can further tighten up its carbon market system at home. With international competition hopefully less of a concern, it plans to phase out some leniencies, such as some of the free emission allowances, that existed to help keep domestic industries competitive.

That’s a big deal, says Cosbey. Dozens of countries have carbon pricing systems, but they all create exceptions to keep heavy industry from getting obliterated by international competition. The carbon border tariff could allow the EU to truly force its industries—and consumers—to pay the price, he says.

“That is ambitious; nobody in the world is doing that.”

A big boost to Europe’s climate-change goals Read More »

cdc-recommends-spring-covid-booster-for-people-65-and-up

CDC recommends spring COVID booster for people 65 and up

65 and up, booster dose, CDC, COVID-19, COVID-19 vaccine, health, hospitalization, Science, spring booster / /

More protection —

The shot should be taken at least four months since the last COVID vaccination.

–

The Moderna Spikevax COVID-19 vaccine is shown at a CVS in 2023.

Enlarge / The Moderna Spikevax COVID-19 vaccine is shown at a CVS in 2023.

People ages 65 and up should get another dose of a COVID-19 vaccine this spring, given the age group’s higher risk of severe disease and death from the pandemic virus, the Centers for Disease Control and Prevention announced Wednesday.

Earlier today, an advisory committee for the CDC voted overwhelmingly in favor of recommending the spring booster dose. And late this afternoon, CDC Director Mandy Cohen signed off on the recommendation, allowing boosting to begin.

“Today’s recommendation allows older adults to receive an additional dose of this season’s COVID-19 vaccine to provide added protection,” Cohen said in a statement. “Most COVID-19 deaths and hospitalizations last year were among people 65 years and older. An additional vaccine dose can provide added protection that may have decreased over time for those at highest risk.”

The spring booster will be an additional shot of the 2023–2024 COVID-19 vaccines made by Pfizer-BioNTech, Moderna, and Novavax. The booster dose should be taken after at least four months have passed since a previous COVID-19 vaccination. However, as FDA representative David Kaslow noted in today’s advisory committee meeting, the FDA will likely approve a 2024–2025 version of COVID-19 vaccines for this coming fall. Given that, it’s best for people to get their spring booster dose by the end of June, so they can be ready for another booster before the winter when COVID-19 has generally peaked.

A report published earlier this month by the CDC found that the 2023–2024 COVID-19 vaccine was about 54 percent effective at preventing symptomatic COVID-19 when compared against people who had not received the latest vaccine. However, the CDC estimates that only about 22 percent of adults in the US have gotten a COVID-19 booster this season, and just over 40 percent of people ages 65 and up have gotten the shot.

People over age 65 made up 67 percent of COVID-19 hospitalizations between October 2023 and January 2024, according to CDC data presented at today’s advisory committee meeting. In early January, COVID-19 hospitalizations hit a seasonal high of about 35,000 weekly new admissions per week and nearly 2,500 weekly deaths.

The advisers debated how to word their recommendation for a spring booster and whether getting a booster should require consulting with a health care provider. But, ultimately, the committee decided on a more permissive recommendation, allowing anyone in the age group who wants a booster to be able to freely get one, including at convenient locations, such as local pharmacies.

“Data continues to show the importance of vaccination to protect those most at risk for severe outcomes of COVID-19,” the CDC said in its announcement of the recommendation. “An additional dose of the updated COVID-19 vaccine may restore protection that has waned since a fall vaccine dose, providing increased protection to adults ages 65 years and older.”

The CDC noted that its previous recommendations allow people who are immunocompromised to get additional doses of the COVID-19 vaccines.

CDC recommends spring COVID booster for people 65 and up Read More »

that-moment-when-you-land-on-the-moon,-break-a-leg,-and-are-about-to-topple-over

That moment when you land on the Moon, break a leg, and are about to topple over

intuitive machines, Science, Space / /

Goodnight, Odie —

“We hit harder than expected and skidded along the way.”

–

A photo of <em>Odysseus</em> the moment before it gently toppled over.” src=”https://cdn.arstechnica.net/wp-content/uploads/2024/02/IM1-800×437.jpg”></img><figcaption> <p><a data-height=Enlarge / A photo of Odysseus the moment before it gently toppled over.

Intuitive Machines

After six days and the public release of new images, engineers have finally pieced together the moments before, during, and after the Odysseus lander touched down on the Moon.

During a news conference on Wednesday, the chief executive of Intuitive Machines, Steve Altemus, described what his company has learned about what happened last Thursday evening as Odysseus made its powered descent down to the Moon.

From their control room in Houston, the mission operators watched with fraying nerves, as their range finders had failed. A last-minute effort to use altitude data from a NASA payload on board failed because the flight computer on board Odysseus could not ingest it in time. So the lander was, in essence, coming down to the Moon without any real-time altimetry data.

The last communication the operators received appeared to show that Odysseus had touched down on the Moon and was upright. But then, to their horror, all telemetry from the spacecraft ceased. The data on the flight controllers’ consoles in Houston froze. They feared the worst.

Skidding down to the Moon

About 10 minutes later, the lander sent a weak signal back. In that initial trickle of data, based on the lander’s inertial measurement unit, it appeared that Odysseus was partly on its side. But there were confusing signals.

On Wednesday, Altemus explained what the team has since pieced together. Because of the lack of altimetry data, Odysseus thought it was about 100 meters higher above the lunar surface than it actually was, so as it touched down it was traveling about three times faster than intended, about 3 meters per second. It was also moving laterally, with respect to the ground, at about 1 meter per second.

“We hit harder than expected and skidded along the way,” Altemus explained.

As it impacted and skidded, the spacecraft’s main engine was still firing. Then, just as the spacecraft touched down more firmly, there was a spike in the engine’s combustion chamber. This is consistent with the bell-shaped engine nozzle coming into contact with the lunar surface.

It is perhaps worth pausing a moment here to consider that this spacecraft, launched a week earlier, had just made an autonomous landing without knowing precisely where it was. But now it found itself on the Moon. Upon impact, one or more of the landing legs snapped as it came down hard. Then, at that very moment, with the engine still burning, an onboard camera snapped an image of the scene. Intuitive Machines published this photo on Wednesday. It’s spectacular.

“We sat upright, with the engine firing for a period of time,” Altemus said. “Then as it wound down, the vehicle just gently tipped over.”

Odysseus at rest on the lunar surface.” height=”1307″ src=”https://cdn.arstechnica.net/wp-content/uploads/2024/02/IM2-980×1307.jpg” width=”980″>

Enlarge / Odysseus at rest on the lunar surface.

Intuitive Machines

Based on the gravity of the Moon, Intuitive Machines and NASA calculated that it took about two seconds to tip over. The lander fell on its side, with a helium tank or radio shelf contacting the Moon. This protrusion, combined with the 12-degree slope of the terrain, means that Odysseus is now gently leaning on the lunar surface at about a 30-degree angle. On Tuesday, the spacecraft returned an image that verified these conclusions.

“We have that photo now to confirm that’s the orientation,” Altemus said.

Sleepy time

As Intuitive Machines has better understood the situation and the status of its vehicle, it has been able to download a torrent of data. NASA has gotten valuable information from all six of its payloads on board, said a project scientist for the space agency, Sue Lederer. As of Wednesday, NASA had been able to download about 50MB of data. The baseline for success was a single bit of data.

But time is running out as the Sun dips toward the horizon. Odysseus will run out of power as soon as Wednesday evening, entering the long lunar night. In about three weeks, as sunlight starts to hit the spacecraft’s solar panels again, Intuitive Machines will try to wake up the spacecraft. The odds are fairly long. The chemistry of its lithium-ion batteries doesn’t like cold, and temperatures will plummet to minus-280° Fahrenheit (minus-173° Celsius) in a few days. That may wreck the batteries or crack the electronics in the flight computer.

Yet hope remains eternal for a spacecraft its operators have taken to affectionately calling Odie. It has defied the odds so far. “He’s a scrappy little dude,” Lederer said. “I have confidence in Odie at this point.”

That moment when you land on the Moon, break a leg, and are about to topple over Read More »

it-turns-out-that-odysseus-landed-on-the-moon-without-any-altimetry-data

It turns out that Odysseus landed on the Moon without any altimetry data

Features, lunar lander, odysseus, Science, Space, Uncategorized / /
Intuitive Machines' <em>Odysseus</em> lander is shown shortly before touching down on the Moon. ” src=”https://cdn.arstechnica.net/wp-content/uploads/2024/02/IM-1-800×600.jpg”></img><figcaption> <p><a data-height=Enlarge / Intuitive Machines’ Odysseus lander is shown shortly before touching down on the Moon.

Intuitive Machines

HOUSTON—Steve Altemus beamed with pride on Tuesday morning as he led me into Mission Control for the Odysseus lander, which is currently operating on the Moon and returning valuable scientific data to Earth. A team of about a dozen operators sat behind consoles, attempting to reset a visual processing unit onboard the lunar lander, one of their last, best chances to deploy a small camera that would snap a photo of Odysseus in action.

“I just wanted you to see the team,” he said.

The founder and chief executive of Intuitive Machines, which for a few days this month has been the epicenter of the spaceflight universe after landing the first commercial vehicle on the Moon, invited me to the company’s nerve center in Houston to set some things straight.

“You can say whatever you want to say,” Altemus said. “But from my perspective, this is an absolute success of a mission. Holy crap. The things that you go through to fly to the Moon. The learning, just every step of the way, is tremendous.”

Altemus will participate in a news conference on Wednesday at Johnson Space Center to provide a fuller perspective of the journey of Odysseus to the Moon and all those learnings. But I got the sense he invited me to the company’s offices Tuesday because he was itching to tell someone—to tell the world—that although Odysseus had toppled over after touching down, the mission was, in his words, an absolute success.

After more than an hour of speaking with Altemus, I believe him.

Odysseus is a beastly machine, and the team flying it isn’t shabby, either. They have certainly busted their asses. The offices in south Houston were littered with the remains of junk food, coffee, and other elixirs of long nights and wracked brains. It’s all been a whirlwind, no doubt. Next to a bag of tortilla chips, there was a bottle of Ibuprofen.

Coming in blind

As has been previously reported, Intuitive Machines discovered that the range finders on Odysseus were inoperable a couple of hours before it was due to attempt to land on the Moon last Thursday. This was later revealed to be due to the failure to install a pencil-sized pin and a wire harness that enabled the laser to be turned on and off. As a result, the company scrambled to rewrite its software to take advantage of three telescopes on a NASA payload, the Navigation Doppler Lidar for Precise Velocity and Range Sensing, for altimetry purposes.

While this software patch mostly worked, Altemus said Tuesday that the flight computer onboard Odysseus was unable to process data from the NASA payload in real time. Therefore, the last accurate altitude reading the lander received came when it was 15 kilometers above the lunar surface—and still more than 12 minutes from touchdown.

That left the spacecraft, which was flying autonomously, to rely on its optical navigation cameras. By comparing imagery data frame by frame, the flight computer could determine how fast it was moving relative to the lunar surface. Knowing its initial velocity and altitude prior to initiating powered descent and using data from the inertial measurement unit (IMU) on board Odysseus, it could get a rough idea of altitude. But that only went so far.

“So we’re coming down to our landing site with no altimeter,” Altemus said.

Unfortunately, as it neared the lunar surface, the lander believed it was about 100 meters higher relative to the Moon than it actually was. So instead of touching down with a vertical velocity of just 1 meter per second and no lateral movement, Odysseus was coming down three times faster and with a lateral speed of 2 meters per second.

“That little geometry made us hit a little harder than we wanted to,” he said.

But all was not lost. Based upon data downloaded from the spacecraft and imagery from NASA’s Lunar Reconnaissance Orbiter, which flew over the landing site, Intuitive Machines has determined that the lander came down to the surface and likely skidded. This force caused one of its six landing legs to snap. Then, for a couple of seconds, the lander stood upright before toppling over due to the failed leg.

The company has an incredible photo of this moment showing the lander upright, with the snapped leg and the engine still firing. Altemus plans to publicly release this photo Wednesday.

It turns out that Odysseus landed on the Moon without any altimetry data Read More »