Science

after-coming-back-from-the-dead,-the-world’s-largest-aircraft-just-flew-a-real-payload

After coming back from the dead, the world’s largest aircraft just flew a real payload

Science, Space, stratolaunch / /

Roc-n-roll —

Falling just short of hypersonic velocity.

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The world's largest aircraft takes off with the Talon A vehicle on Saturday.

Enlarge / The world’s largest aircraft takes off with the Talon A vehicle on Saturday.

Stratolaunch/Matt Hartman

Built and flown by Stratolaunch, the massive Roc aircraft took off from Mojave Air and Space Port in California on Saturday. The airplane flew out over the Pacific Ocean, where it deployed the Talon-A vehicle, which looks something like a mini space shuttle.

This marked the first time this gargantuan airplane released an honest-to-goodness payload, the first Talon-A vehicle, TA-1, which is intended to fly at hypersonic speed. During the flight, TA-1 didn’t quite reach hypersonic velocity, which begins at Mach 5, or five times greater than the speed of sound.

“While I can’t share the specific altitude and speed TA-1 reached due to proprietary agreements with our customers, we are pleased to share that in addition to meeting all primary and customer objectives of the flight, we reached high supersonic speeds approaching Mach 5 and collected a great amount of data at an incredible value to our customers,” said Zachary Krevor, chief executive of Stratolaunch, in a statement.

In essence, the TA-1 vehicle is a pathfinder for subsequent versions of the vehicle that will be both reusable and capable of reaching hypersonic speeds. The flight of the company’s next vehicle, TA-2, could come later this year, Krevor said.

A long road

It has been a long, strange road for Stratolaunch to reach this moment. The company was founded in 2011 to build a super-sized carrier aircraft from which rockets would be launched mid-air. It was bankrolled by Microsoft cofounder and airplane enthusiast Paul Allen, who put at least hundreds of millions of dollars into the private project.

As the design of the vehicle evolved, its wingspan grew to 117 meters, nearly double the size of a Boeing 747 aircraft. It far exceeded the wingspan of the Spruce Goose, built by Howard Hughes in the 1940s, which had a wingspan of 97.5 meters. The Roc aircraft was so large that it seemed impractical to fly on a regular basis.

At the same time, the company was struggling to identify a rocket that could be deployed from the aircraft. At various times, Stratolaunch worked with SpaceX and Orbital ATK to develop a launch vehicle. But both of those partnerships fell through, and eventually, the company said it would develop its own line of rockets.

Allen would never see his large plane fly, dying of septic shock in October 2018 due to his non-Hodgkin lymphoma. Roc did finally take flight for the first time in April 2019, but it seemed like a Pyrrhic victory. Following the death of Allen, for whom Stratolaunch was a passion project, the company’s financial future was in doubt. Later in 2019, Allen’s family put the company’s assets up for sale and said it would cease to exist.

However, Stratolaunch did not die. Rather, the aircraft was acquired by the private equity firm Cerberus, and in 2020, the revitalized Stratolaunch changed course. Instead of orbital rockets, it would now launch hypersonic vehicles to test the technology—a priority for the US military. China, Russia, and the United States are all racing to develop hypersonic missiles, as well as new countermeasure technology as high-speed missiles threaten to penetrate most existing defenses.

Featuring a new engine

This weekend’s flight also marked an important moment for another US aerospace company, Ursa Major Technologies. The TA-1 vehicle was powered by the Hadley rocket engine designed and built by Ursa Major, which specializes in the development of rocket propulsion engines.

Hadley is a 5,000-lb-thrust liquid oxygen and kerosene, oxygen-rich staged combustion cycle rocket engine for small vehicles. Its known customers include Stratolaunch and a vertical launch company, Phantom Space, which is developing a small orbital rocket.

Founded in 2015, Ursa Major seeks to provide off-the-shelf propulsion solutions to launch customers. While Ursa Major started small, the company is already well into the development of its much larger Ripley engine. With 50,000 pounds of thrust, Ripley is aimed at the medium-launch market. The company completed a hot-fire test campaign of Ripley last year. For Ursa Major, it must feel pretty good to finally see an engine in flight.

After coming back from the dead, the world’s largest aircraft just flew a real payload Read More »

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Shields up: New ideas might make active shielding viable

active shielding, Features, Science / /
Shields up: New ideas might make active shielding viable

Aurich Lawson | Getty Images | NASA

On October 19, 1989, at 12: 29 UT, a monstrous X13 class solar flare triggered a geomagnetic storm so strong that auroras lit up the skies in Japan, America, Australia, and even Germany the following day. Had you been flying around the Moon at that time, you would have absorbed well over 6 Sieverts of radiation—a dose that would most likely kill you within a month or so.

This is why the Orion spacecraft that is supposed to take humans on a Moon fly-by mission this year has a heavily shielded storm shelter for the crew. But shelters like that aren’t sufficient for a flight to Mars—Orion’s shield is designed for a 30-day mission.

To obtain protection comparable to what we enjoy on Earth would require hundreds of tons of material, and that’s simply not possible in orbit. The primary alternative—using active shields that deflect charged particles just like the Earth’s magnetic field does—was first proposed in the 1960s. Today, we’re finally close to making it work.

Deep-space radiation

Space radiation comes in two different flavors. Solar events like flares or coronal mass ejections can cause very high fluxes of charged particles (mostly protons). They’re nasty when you have no shelter but are relatively easy to shield against since solar protons are mostly low energy. The majority of solar particle events flux is between 30 Mega-electronVolts to 100 MeV and could be stopped by Orion-like shelters.

Then there are galactic cosmic rays: particles coming from outside the Solar System, set in motion by faraway supernovas or neutron stars. These are relatively rare but are coming at you all the time from all directions. They also have high energies, starting at 200 MeV and going to several GeVs, which makes them extremely penetrating. Thick masses don’t provide much shielding against them. When high-energy cosmic ray particles hit thin shields, they produce many lower-energy particles—you’d be better off with no shield at all.

The particles with energies between 70 MeV and 500 MeV are responsible for 95 percent of the radiation dose that astronauts get in space. On short flights, solar storms are the main concern because they can be quite violent and do lots of damage very quickly. The longer you fly, though, GCRs become more of an issue because their dose accumulates over time, and they can go through pretty much everything we try to put in their way.

What keeps us safe at home

The reason nearly none of this radiation can reach us is that Earth has a natural, multi-stage shielding system. It begins with its magnetic field, which deflects most of the incoming particles toward the poles. A charged particle in a magnetic field follows a curve—the stronger the field, the tighter the curve. Earth’s magnetic field is very weak and barely bends incoming particles, but it is huge, extending thousands of kilometers into space.

Anything that makes it through the magnetic field runs into the atmosphere, which, when it comes to shielding, is the equivalent of an aluminum wall that’s 3 meters thick. Finally, there is the planet itself, which essentially cuts the radiation in half since you always have 6.5 billion trillion tons of rock shielding you from the bottom.

To put that in perspective, the Apollo crew module had on average 5 grams of mass per square centimeter standing between the crew and radiation. A typical ISS module has twice that, about 10 g/cm2. The Orion shelter has 35–45 g/cm2, depending on where you sit exactly, and it weighs 36 tons. On Earth, the atmosphere alone gives you 810 g/cm2—roughly 20 times more than our best shielded spaceships.

The two options are to add more mass—which gets expensive quickly—or to shorten the length of the mission, which isn’t always possible. So solving radiation with passive mass won’t cut it for longer missions, even using the best shielding materials like polyethylene or water. This is why making a miniaturized, portable version of the Earth’s magnetic field was on the table from the first days of space exploration. Unfortunately, we discovered it was far easier said than done.

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These scientists built their own Stone Age tools to figure out how they were used

Archaeology, paleolithic, Science, stone age, tool use, traceology / /

hands-on experiments —

Telltale fractures and microscopic wear marks should be applicable to real artifacts.

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Testing replica Stone Age tools with a bit of wood-scraping.

Enlarge / Testing replica Stone Age tools with a bit of wood-scraping.

A. Iwase et al., 2024/Tokyo Metropolitan University

When Japanese scientists wanted to learn more about how ground stone tools dating back to the Early Upper Paleolithic might have been used, they decided to build their own replicas of adzes, axes, and chisels and used those tools to perform tasks that might have been typical for that era. The resulting fractures and wear enabled them to develop new criteria for identifying the likely functions of ancient tools, according to a recent paper published in the Journal of Archaeological Science.  If these kinds of traces were indeed found on genuine Stone Age tools, it would be evidence that humans had been working with wood and honing techniques significantly earlier than previously believed.

The development of tools and techniques for woodworking purposes started out simple, with the manufacture of cruder tools like the spears and throwing sticks common in the early Stone Age. Later artifacts dating back to Mesolithic and Neolithic time periods were more sophisticated, as people learned how to use polished stone tools to make canoes, bows, wells, and to build houses. Researchers typically date the emergence of those stone tools to about 10,000 years ago. However, archaeologists have found lots of stone artifacts with ground edges dating as far back as 60,000 to 30,000 years ago. But it’s unclear how those tools might have been used.

So Akira Iwase of Tokyo Metropolitan University and co-authors made their own replicas of adzes and axes out of three raw materials common to the region between 38,000 and 30,000 years ago: semi-nephrite rocks, hornfels rocks, and tuff rocks. They used a stone hammer and anvil to create various long oval shapes and polished the edges with either a coarse-grained sandstone or a medium-grained tuff. There were three types of replica tools: adze-types, with the working edge oriented perpendicular to the long axis of a bent handle; axe-types, with a working edge parallel to the bent handle’s long axis; and chisel-types, in which a stone tool was placed at the end of a straight handle.

Testing various replicas of Stone Age tools for different uses: A, tree-felling; B, wood-adzing; C, wood-scraping; D, fresh bone-adzing; E, dry hide-scraping; F, disarticulation of a joint.

Enlarge / Testing various replicas of Stone Age tools for different uses: A, tree-felling; B, wood-adzing; C, wood-scraping; D, fresh bone-adzing; E, dry hide-scraping; F, disarticulation of a joint.

A. Iwase et al., 2024/Tokyo Metropolitan University

Then it was time to test the replica tools via ten different usage experiments. For instance, the authors used axe-type tools to fell Japanese cedar and maple trees in north central Honshu, as well as a forest near Tokyo Metropolitan University. Axe-type and adze-type tools were used to make a dugout canoe and wooden spears, while adze-type tools and chisel-type tools were used to scrape off the bark of fig and pine. They scraped flesh and grease from fresh and dry hides of deer and boar using adze-type and chisel-type tools. Finally, they used adze-type tools to disarticulate the femur and tibia joints of deer hindlimbs.

The team also conducted several experiments in which the tools were not used to identify accidental fractures not related to any tool-use function. For instance, flakes and blades can break in half during flint knapping; transporting tools in, say, small leather bags can cause microscopic flaking; and trampling on tools left on the ground can also modify the edges. All these scenarios were tested. All the tools used in both use and non-use experiments,ents were then examined for both macroscopic and microscopic traces of fracture or wear.

Traces left by tree-felling experiments on replica stone age tools. Characteristic macroscopic (top) and microscopic (bottom) traces might be used to determine how stone edges were used.

Enlarge / Traces left by tree-felling experiments on replica stone age tools. Characteristic macroscopic (top) and microscopic (bottom) traces might be used to determine how stone edges were used.

Tokyo Metropolitan University

The results: they were able to identify nine different types of macroscopic fractures, several of which were only seen when making percussive motions, particularly in the case of felling trees. There were also telltale microscopic traces resulting from friction between the wood and stone edge. Cutting away at antlers and bones caused a lot of damage to the edges of adze-like tools, creating long and/or wide bending fractures. The tools used for limb disarticulation caused fairly large bending fractures and smaller flaking scars, while only nine out of 21 of the scraping tools showed macroscopic signs of wear, despite hundreds of repeated strokes.

The authors concluded that examining macroscopic fracture patterns alone are insufficient to determine whether a given stone tool had been used percussively. Nor is any resulting micropolish from abrasion an unambiguous indicator on its own, since scraping motions produce a similar micropolish.  Combining the two, however, did yield more reliable conclusions about which tools had been used percussively to fell trees, compared to other uses, such as disarticulation of bones.

DOI: Journal of Archaeological Science, 2024. 10.1016/j.jas.2023.105891  (About DOIs).

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A hunk of junk from the International Space Station hurtles back to Earth

human spaceflight, international space station, Science, Space, space debris / /
In March 2021, the International Space Station's robotic arm released a cargo pallet with nine expended batteries.

Enlarge / In March 2021, the International Space Station’s robotic arm released a cargo pallet with nine expended batteries.

NASA

A bundle of depleted batteries from the International Space Station careened around Earth for almost three years before falling out of orbit and plunging back into the atmosphere Friday. Most of the trash likely burned up during reentry, but it’s possible some fragments may have reached Earth’s surface intact.

Larger pieces of space junk regularly fall to Earth on unguided trajectories, but they’re usually derelict satellites or spent rocket stages. This involved a pallet of batteries from the space station with a mass of more than 2.6 metric tons (5,800 pounds). NASA intentionally sent the space junk on a path toward an unguided reentry.

Naturally self-cleaning

Sandra Jones, a NASA spokesperson, said the agency “conducted a thorough debris analysis assessment on the pallet and has determined it will harmlessly reenter the Earth’s atmosphere.” This was, by far, the most massive object ever tossed overboard from the International Space Station.

The batteries reentered the atmosphere at 2: 29 pm EST (1929 UTC), according to US Space Command. At that time, the pallet would have been flying between Mexico and Cuba. “We do not expect any portion to have survived reentry,” Jones told Ars.

The European Space Agency (ESA) also monitored the trajectory of the battery pallet. In a statement this week, the ESA said the risk of a person being hit by a piece of the pallet was “very low” but said “some parts may reach the ground.” Jonathan McDowell, an astrophysicist who closely tracks spaceflight activity, estimated about 500 kilograms (1,100 pounds) of debris would hit the Earth’s surface.

“The general rule of thumb is that 20 to 40 percent of the mass of a large object will reach the ground, though it depends on the design of the object,” the Aerospace Corporation says.

A dead ESA satellite reentered the atmosphere in a similar uncontrolled manner February 21. At 2.3 metric tons, this satellite was similar in mass to the discarded battery pallet. ESA, which has positioned itself as a global leader in space sustainability, set up a website that provided daily tracking updates on the satellite’s deteriorating orbit.

This map shows the track of the unguided cargo pallet around the Earth over the course of six hours Friday. It reentered the atmosphere near Cuba on southwest-to-northeast heading.

Enlarge / This map shows the track of the unguided cargo pallet around the Earth over the course of six hours Friday. It reentered the atmosphere near Cuba on southwest-to-northeast heading.

As NASA and ESA officials have said, the risk of injury or death from a spacecraft reentry is quite low. Falling space debris has never killed anyone. According to ESA, the risk of a person getting hit by a piece of space junk is about 65,000 times lower than the risk of being struck by lightning.

This circumstance is unique in the type and origin of the space debris, which is why NASA purposely cast it away on an uncontrolled trajectory back to Earth.

The space station’s robotic arm released the battery cargo pallet on March 11, 2021. Since then, the batteries have been adrift in orbit, circling the planet about every 90 minutes. Over a span of months and years, low-Earth orbit is self-cleaning thanks to the influence of aerodynamic drag. The resistance of rarefied air molecules in low-Earth orbit gradually slowed the pallet’s velocity until, finally, gravity pulled it back into the atmosphere Friday.

The cargo pallet, which launched inside a Japanese HTV cargo ship in 2020, carried six new lithium-ion batteries to the International Space Station. The station’s two-armed Dextre robot, assisted by astronauts on spacewalks, swapped out aging nickel-hydrogen batteries for the upgraded units. Nine of the old batteries were installed on the HTV cargo pallet before its release from the station’s robotic arm.

A hunk of junk from the International Space Station hurtles back to Earth Read More »

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Study finds that we could lose science if publishers go bankrupt

Academic publishing, Science, Science communications / /

Need backups —

A scan of archives shows that lots of scientific papers aren’t backed up.

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A set of library shelves with lots of volumes stacked on them.

Back when scientific publications came in paper form, libraries played a key role in ensuring that knowledge didn’t disappear. Copies went out to so many libraries that any failure—a publisher going bankrupt, a library getting closed—wouldn’t put us at risk of losing information. But, as with anything else, scientific content has gone digital, which has changed what’s involved with preservation.

Organizations have devised systems that should provide options for preserving digital material. But, according to a recently published survey, lots of digital documents aren’t consistently showing up in the archives that are meant to preserve it. And that puts us at risk of losing academic research—including science paid for with taxpayer money.

Tracking down references

The work was done by Martin Eve, a developer at Crossref. That’s the organization that organizes the DOI system, which provides a permanent pointer toward digital documents, including almost every scientific publication. If updates are done properly, a DOI will always resolve to a document, even if that document gets shifted to a new URL.

But it also has a way of handling documents disappearing from their expected location, as might happen if a publisher went bankrupt. There are a set of what’s called “dark archives” that the public doesn’t have access to, but should contain copies of anything that’s had a DOI assigned. If anything goes wrong with a DOI, it should trigger the dark archives to open access, and the DOI updated to point to the copy in the dark archive.

For that to work, however, copies of everything published have to be in the archives. So Eve decided to check whether that’s the case.

Using the Crossref database, Eve got a list of over 7 million DOIs and then checked whether the documents could be found in archives. He included well-known ones, like the Internet Archive at archive.org, as well as some dedicated to academic works, like LOCKSS (Lots of Copies Keeps Stuff Safe) and CLOCKSS (Controlled Lots of Copies Keeps Stuff Safe).

Not well-preserved

The results were… not great.

When Eve broke down the results by publisher, less than 1 percent of the 204 publishers had put the majority of their content into multiple archives. (The cutoff was 75 percent of their content in three or more archives.) Fewer than 10 percent had put more than half their content in at least two archives. And a full third seemed to be doing no organized archiving at all.

At the individual publication level, under 60 percent were present in at least one archive, and over a quarter didn’t appear to be in any of the archives at all. (Another 14 percent were published too recently to have been archived or had incomplete records.)

The good news is that large academic publishers appear to be reasonably good about getting things into archives; most of the unarchived issues stem from smaller publishers.

Eve acknowledges that the study has limits, primarily in that there may be additional archives he hasn’t checked. There are some prominent dark archives that he didn’t have access to, as well as things like Sci-hub, which violates copyright in order to make material from for-profit publishers available to the public. Finally, individual publishers may have their own archiving system in place that could keep publications from disappearing.

Should we be worried?

The risk here is that, ultimately, we may lose access to some academic research. As Eve phrases it, knowledge gets expanded because we’re able to build upon a foundation of facts that we can trace back through a chain of references. If we start losing those links, then the foundation gets shakier. Archiving comes with its own set of challenges: It costs money, it has to be organized, consistent means of accessing the archived material need to be established, and so on.

But, to an extent, we’re failing at the first step. “An important point to make,” Eve writes, “is that there is no consensus over who should be responsible for archiving scholarship in the digital age.”

A somewhat related issue is ensuring that people can find the archived material—the issue that DOIs were designed to solve. In many cases, the authors of the manuscript place copies in places like the arXiv/bioRxiv, or the NIH’s PubMed Centra (this sort of archiving is increasingly being made a requirement by funding bodies). The problem here is that the archived copies may not include the DOI that’s meant to ensure it can be located. That doesn’t mean it can’t be identified through other means, but it definitely makes finding the right document much more difficult.

Put differently, if you can’t find a paper or can’t be certain you’re looking at the right version of it, it can be just as bad as not having a copy of the paper at all.

None of this is to say that we’ve already lost important research documents. But Eve’s paper serves a valuable function by highlighting that the risk is real. We’re well into the era where print copies of journals are irrelevant to most academics, and digital-only academic journals have proliferated. It’s long past time for us to have clear standards in place to ensure that digital versions of research have the endurance that print works have enjoyed.

Journal of Librarianship and Scholarly Communication, 2024. DOI: 10.31274/jlsc.16288  (About DOIs).

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Thousands of US kids are overdosing on melatonin gummies, ER study finds

children, emergency department, ingestion, melatonin, poison control, Science, sleep aid, supplement / /

treats or treatment? —

In the majority of cases, the excessive amounts led to only minimal side effects.

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In this photo illustration, melatonin gummies are displayed on April 26, 2023, in Miami, Florida.

Enlarge / In this photo illustration, melatonin gummies are displayed on April 26, 2023, in Miami, Florida.

Federal regulators have long decried drug-containing products that appeal to kids—like nicotine-containing e-cigarette products with fruity and dessert-themed flavors or edible cannabis products sold to look exactly like name-brand candies.

But a less-expected candy-like product is sending thousands of kids to emergency departments in the US in recent years: melatonin, particularly in gummy form. According to a new report from researchers at the Centers for Disease Control and Prevention, use of the over-the-counter sleep-aid supplement has skyrocketed in recent years—and so have calls to poison control centers and visits to emergency departments.

Melatonin, a neurohormone that regulates the sleep-wake cycle, has become very popular for self-managing conditions like sleep disorders and jet lag—even in children. Use of melatonin in adults rose from 0.4 percent in 1999–2000 to 2.1 percent in 2017–2018. But the more people have these tempting, often candy-like supplements in their homes, the more risk that children will get ahold of them unsupervised. Indeed, the rise in use led to a 530 percent increase in poison control center calls and a 420 percent increase in emergency department visits for accidental melatonin ingestion in infants and kids between 2009 and 2020.

And the problem is ongoing. In the new study, researchers estimate that between 2019 and 2022, nearly 11,000 kids went to the emergency department after accidentally gulping down melatonin supplements. Nearly all the cases involved a solid form of melatonin, with about 47 percent identified specifically as gummies and 49 percent listed as an unspecified sold form, likely to include gummies. These melatonin-based emergency visits made up 7 percent of all emergency visits by infants and kids who ingested medications unsupervised.

The candy-like appeal of melatonin products seems evident in the ages of kids rushed to emergency departments. Most emergency department visits for unsupervised medicine exposures are in infants and toddlers ages 1 to 2, but for melatonin-related visits, half were ages 3 to 5. The researchers noted that among the emergency visits with documentation, about three-quarters of the melatonin products involved came out of bottles, suggesting that the young kids managed to open the bottles themselves or that the bottles weren’t properly closed. Manufacturers are not required to use child-resistant packaging on melatonin supplements.

Luckily, most of the cases had only mild to no effects. Still, about 6.5 percent of the cases—a little over 700 children—were hospitalized from their melatonin binge. A 2022 study led by researchers in Michigan found that among poison control center calls for children consuming melatonin, the reported symptoms involved gastrointestinal, cardiovascular, or central nervous systems. For children who are given supervised doses of melatonin to improve sleep, known side effects include drowsiness, increased bedwetting or urination in the evening, headache, dizziness, and agitation.

According to the National Center for Complementary and Integrative Health—part of the National Institutes of Health—supervised use of melatonin in children appears to be safe for short-term use. But there’s simply not much data on use in children, and the long-term effects of regular use or acute exposures are unknown. The NCCIH cautions: “Because melatonin is a hormone, it’s possible that melatonin supplements could affect hormonal development, including puberty, menstrual cycles, and overproduction of the hormone prolactin, but we don’t know for sure.”

For now, the authors of the new study say the data “highlights the continued need to educate parents and other caregivers about the importance of keeping all medications and supplements (including gummies) out of children’s reach and sight.”

Thousands of US kids are overdosing on melatonin gummies, ER study finds Read More »

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Rocket Report: Starbase will expand into state park; another Japanese rocket

rocket report, Science, Space / /

43 for 477 —

“Those launches are exciting the young minds that are watching them.”

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This satellite view of SpaceX's Starbase facility shows a fully-stacked Starship rocket on the launch pad, just inland from the Gulf of Mexico.

Enlarge / This satellite view of SpaceX’s Starbase facility shows a fully-stacked Starship rocket on the launch pad, just inland from the Gulf of Mexico.

Welcome to Edition 6.34 of the Rocket Report! It’s Starship season again. Yes, SpaceX appears to be about a week away from launching the third full-scale Starship test flight from the company’s Starbase site in South Texas, pending final regulatory approval from the Federal Aviation Administration. Ars will be there. SpaceX plans to build a second Starship launch pad at Starbase, and the company’s footprint there is also about to get a little bigger, with the expected acquisition of 43 acres of Texas state park land.

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.

Astra’s founders take the company private. Astra’s three-year run as a public company is over. Chris Kemp and Adam London, Astra’s co-founders, are taking the company private after a string of rocket failures and funding shortfalls, Ars reports. Kemp and London bought the company for 50 cents a share. Astra’s board approved the transaction, the company announced Thursday, as the only alternative to bankruptcy. Kemp and London founded Astra in 2016. After emerging from stealth mode in 2020, Astra launched its light-class launcher, called Rocket 3, seven times, but five of those flights were failures. Astra went public via a special purpose acquisition company (or SPAC) in 2021, reaching a valuation of more than $2 billion. Today, its market cap sits at approximately $13 million.

What’s next for Astra? … Where Astra goes from here is anyone’s guess. The company abandoned its unreliable Rocket 3 vehicle in 2022 to focus on the larger Rocket 4 vehicle. But Rocket 4 is likely months or years from the launch pad. It faces stiff competition not just from established small launch players such as Rocket Lab and Firefly but also from new entrants as well, including ABL Space and Stoke Space. Additionally, all of these small launch companies have been undercut in price by SpaceX’s Transporter missions, which launch dozens of satellites at a time on the Falcon 9 booster. Additionally, Astra’s spacecraft engine business—acquired previously from Apollo Fusion—may or may not be profitable now, but there are questions about its long-term viability as well.

Virgin Galactic is retiring its only operational spaceship. Over the last year, Virgin Galactic has proven it has the technical acumen to pull off monthly flights of its VSS Unity rocket plane, each carrying six people on a suborbital climb to the edge of space. But VSS Unity has never been profitable. It costs too much and takes too much time to reconfigure between flights. Virgin Galactic plans to fly the suborbital spaceship one more time before taking a hiatus from flight operations, Ars reports. This, along with layoffs announced last year, will allow the company to preserve cash while focusing on the development of a new generation of rocket planes, called Delta-class ships, designed to fly more often and with more people. Michael Colglazier, Virgin Galactic’s president and CEO, says the first of the 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.

Bigger and faster… The Delta ships will each carry six customers in the spacecraft’s pressurized passenger cabin, compared to a maximum of four passengers on each VSS Unity flight. Virgin Galactic’s goal is to fly each Delta ship eight times per month, and the company will do this by eliminating many of the inspections required between each VSS Unity flight. The company is building a Delta ship structural test article to put through extensive checks on the ground, validating component life and cycle limits for major components of the vehicle. This will give engineers enough confidence to forego many inspections, according to Mike Moses, president of Virgin Galactic’s spaceline operations. Virgin Galactic has nearly $1 billion in cash or cash equivalents on its balance sheet, so it’s not in any immediate financial trouble. But the company reported just $7 million in revenue last year, with a net loss of $502 million. So, there’s an obvious motivation to make a change.

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A new Japanese rocket will launch this weekend. A privately held Japanese company named Space One is set to shoot for orbit with the first flight of its Kairos rocket Friday night (US time), News on Japan reports. Space One will attempt to become the first Japanese private company to launch a rocket into orbit. Japan’s existing launch vehicles, like the H-IIA, the H3, and the Epsilon, were developed with funding from the Japanese space agency. But there is some involvement from the Japanese government on this flight. The Kairos rocket will launch with a small “quick response” spacecraft for the Cabinet Intelligence and Research Office, which is responsible for Japan’s fleet of spy satellites. Kairos, which is the Ancient Greek word for “timeliness,” is made up of three solid-fueled stages and a liquid-fueled upper stage. It can place a payload of up to 550 pounds (250 kilograms) into low-Earth orbit.

Winning hearts and minds… The Kairos rocket will take off from Space One’s Space Port Kii, located on a south-facing peninsula on the main Japanese island of Honshu. This new launch site is hundreds of miles away from Japan’s existing spaceports. Local businesses see the arrival of the space industry in this remote part of Japan as a marketing opportunity. A local confectionery store, not wanting to miss the opportunity to attract visitors, is selling manju shaped like rockets. There are two paid viewing areas to watch the launch, and a total of 5,000 seats sold out in just two days, according to News on Japan. (submitted by tsunam)

UK spaceport project to get 10 million pounds from government. The UK government has pledged 10 million pounds in funding to SaxaVord Spaceport in Scotland, European Spaceflight reports. This funding is sorely needed for SaxaVord, which slowed construction last year after its developer ran into financial trouble. In the last couple of months, SaxaVord raised enough money to resume payments to the contractors building the launch site. The UK government’s pledge of 10 million pounds for SaxaVord apparently is not quite a done deal. The UK’s science minister posted on X that the funding was “subject to due diligence.” SaxaVord will eventually have three launch pads, one of which has been dedicated to German launch startup Rocket Factory Augsburg. This company’s rocket, RFA ONE, is expected to be the first orbital launch from SaxaVord later this year.

The UK spaceport scene… The UK government, local entities, and private industry are making a pretty serious effort to bring orbital launches to the British Isles. Spaceport Cornwall became the first UK facility to host an orbital attempt last year with the failed launch of Virgin Orbit’s LauncherOne rocket, which was released from a carrier jet that took off from Cornwall. There are several vertical launch spaceports under construction or in the concept development phase. SaxaVord appears to be among those closest to reality, along with Sutherland spaceport, also in Scotland, to be used by the UK launch startup Orbex Space. (submitted by Ken the Bin)

Rocket Report: Starbase will expand into state park; another Japanese rocket Read More »

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After Astra loses 99 percent of its value, founders take rocket firm private

astra, Science, Space / /

What goes up must come down —

First you burn the cash, then comes the crash.

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Image of a rocket launch.

Enlarge / Liftoff of Astra’s Rocket 3.0 from Cape Canaveral, Florida.

Astra’s long, strange trip in the space business is taking another turn. The company announced Thursday that it is going private at an extremely low valuation.

Four years ago, the rocket company, based in Alameda, California, emerged from stealth with grand plans to develop a no-frills rocket that could launch frequently. “The theme that really makes this company stand out, which will capture the imagination of our customers, our investors, and our employees, is the idea that every day we will produce and launch a rocket,” Astra co-founder Chris Kemp said during a tour of the factory in February 2020.

Almost exactly a year later, on February 2, 2021, Astra went public via a special purpose acquisition company (or SPAC). “The transaction reflects an implied pro-forma enterprise value for Astra of approximately $2.1 billion,” the company stated at the time. For a time, the company’s stock even traded above this valuation.

But then, rockets started failing. Only two of the seven launches of the company’s “Rocket 3” vehicle were successful. In August 2022, the company announced a pivot to the larger Rocket 4 vehicle. It planned to begin conducting test launches in 2023, but that did not happen. Accordingly, the company’s stock price plummeted.

Last November Kemp and the company’s co-founder, Adam London, proposed to buy Astra shares at $1.50, approximately double their price. The company’s board of directors did not accept the deal. Then, in late February, Kemp and London sharply cut their offer to take the company private, warning of “imminent bankruptcy” if the company doesn’t accept their new proposal. They offered $0.50 a share, well below the trading value of approximately $0.80 a share.

On Thursday, Astra said that this deal was being consummated.

“Astra Space, Inc. announced today that it has entered into a definitive merger agreement pursuant to which the acquiring entity has agreed, subject to customary closing conditions, to acquire all shares of Astra common stock not already owned by it for $0.50 per share in cash,” the company stated. The acquiring entity consists of Kemp, London, and other long-term investors.

Where Astra goes from here is anyone’s guess. Rocket 4 is likely months or years from the launch pad. It faces stiff competition not just from established small launch players such as Rocket Lab and Firefly but also from new entrants as well, including ABL Space and Stoke Space. Additionally, all of these small launch companies have been undercut in price by SpaceX’s Transporter missions, which launch dozens of satellites at a time on the Falcon 9 booster.

Additionally, Astra’s spacecraft engine business—acquired previously from Apollo Fusion—may or may not be profitable now, but there are questions about its long-term viability as well.

“I don’t fault management for seizing the opportunity to raise hundreds of millions of dollars by SPAC’ing, but a pre-revenue launch company without a proven rocket was probably never a good match for the public markets,” said Case Taylor, investor and author of the Case Closed newsletter.

Taylor added that he hopes that Astra spacecraft engines find a way to thrive in the new Astra, as the space industry values their performance. “I hope to see that diamond survive and thrive,” he said.

After Astra loses 99 percent of its value, founders take rocket firm private Read More »

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Don’t use these six cinnamon products, FDA warns after concerning lead tests

CDC, cinnamon, contamination, fda, lead, lead poisoning, Science / /

More lead —

The FDA is putting manufacturers on notice to do more to keep contaminants out.

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Don’t use these six cinnamon products, FDA warns after concerning lead tests

Six different ground cinnamon products sold at retailers including Save A Lot, Dollar Tree, and Family Dollar contain elevated levels of lead and should be recalled and thrown away immediately, the US Food and Drug Administration announced Wednesday.

The brands are La Fiesta, Marcum, MK, Swad, Supreme Tradition, and El Chilar, and the products are sold in plastic spice bottles or in bags at various retailers. The FDA has contacted the manufacturers to urge them to issue voluntary recalls, though it has not been able to reach one of the firms, MTCI, which distributes the MK-branded cinnamon.

Products identified by the FDA as containing elevated lead levels.

Enlarge / Products identified by the FDA as containing elevated lead levels.

The announcement comes amid a nationwide outbreak of lead poisoning in young children linked to cinnamon applesauce pouches contaminated with lead and chromium. In that case, it’s believed that a spice grinder in Ecuador intentionally added extreme levels of lead chromate to cinnamon imported from Sri Lanka, likely to improve its weight and/or appearance. Food manufacturer Austrofoods then added the heavily contaminated cinnamon, without any testing, to cinnamon applesauce pouches marketed to toddlers and young children across the US. In the latest update, the Centers for Disease Control and Prevention has identified 468 cases of lead poisoning that have been linked to the cinnamon applesauce pouches. The cases span 44 states and are mostly in very young children.

The alarming contamination spurred the FDA to conduct more sampling of cinnamon products, focusing an initial survey on products from discount retail stores, the agency said. The FDA makes note that the elevated lead levels found in the six products announced this week are significantly lower than what was seen in the cinnamon added to the applesauce pouches. The six products contained lead at levels ranging from 2.03 to 3.4 parts per million (ppm), while samples of the cinnamon added to the applesauce had levels ranging from 2,270 ppm to 5,110 ppm in the cinnamon.

The FDA has previously reported that 2.5 ppm is the limit being considered for bark spices, which includes cinnamon, by the international standard-setting body, Codex Alimentarius Commission.

So the six newly identified products are right around or just over that potential threshold and do not pose the same level of risk as the applesauce pouches. But the FDA warned that the elevated levels in the ground cinnamon could cause elevated blood lead levels after prolonged use, which the agency defined as months to years. This, in turn, could contribute to harmful health effects, particularly in children who absorb lead more readily than adults and are still developing. Lead is a potent neurotoxic metal that can damage the brain and nervous system, which for young children can lead to learning, behavior, and developmental problems.

“Today’s actions serve as a signal to industry that more needs to be done to prevent elevated levels of contaminants from entering our food supply,” Jim Jones, the FDA’s Deputy Commissioner for Human Foods, said in a statement. “Food growers, manufacturers, importers, and retailers share a responsibility for ensuring the safety of the foods that reach store shelves. The levels of lead we found in some ground cinnamon products are too high and we must do better to protect those most vulnerable to the negative health outcomes of exposure to elevated levels of lead.”

Don’t use these six cinnamon products, FDA warns after concerning lead tests Read More »

daily-telescope:-a-brilliant-shot-of-a-comet-as-it-nears-the-sun

Daily Telescope: A brilliant shot of a comet as it nears the Sun

daily telescope, Science, Space / /

A streaker —

The comet should brighten further as it nears the Sun in the coming weeks.

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Comet 12P/Pons-Brooks and the great Andromeda Galaxy.

Enlarge / Comet 12P/Pons-Brooks and the great Andromeda Galaxy.

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 7, and today’s photo features a Halley-type comet that is currently approaching the Sun. It will reach perihelion on April 21.

The comet, named 12P/Pons–Brooks, features a brilliant ion tail, and its nucleus is estimated to be around 30 km in diameter. The comet should brighten further as it nears the Sun in the coming weeks. However, at an apparent magnitude of 4.5, it is unlikely to be visible to the naked eye—that’s why we have telescopes.

12P/Pons–Brooks was imaged here by the Virtual Telescope Project facility in Manciano, Italy. The covered field of view is about 16×11 square degrees, and there is a bonus photobombing by the Andromeda Galaxy.

Source: Gianluca Masi

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

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Russia’s next-generation rocket is a decade old and still flying dummy payloads

angara, angara a5, launch, russia, Science, Space, vostochny / /

A winding road —

Russia’s heavy-lift Angara A5 rocket is about to launch on its fourth test flight.

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Technicians assemble an Angara A5 rocket at the Vostochny Cosmodrome in Russia's Far East.

Enlarge / Technicians assemble an Angara A5 rocket at the Vostochny Cosmodrome in Russia’s Far East.

Roscosmos

By some measures, Russia’s next-generation flagship rocket program—the Angara—is now three decades old. The Russian government approved the development of the Angara rocket in 1992, soon after the fall of the Soviet Union ushered in a prolonged economic recession.

It has been nearly 10 years since Russia launched the first Angara test flights. The heaviest version of the Angara rocket family—the Angara A5—is about to make its fourth flight, and like the three launches before, this mission won’t carry a real satellite.

This next launch will be a milestone for the beleaguered Angara rocket program because it will be the first Angara flight from the Vostochny Cosmodrome, Russia’s newest launch site in the country’s far east. The previous Angara launches were based out of the military-run Plesetsk Cosmodrome in northern Russia.

All dressed up and nowhere to go

On Wednesday, Russia’s space agency, Roscosmos, said technicians at Vostochny have fueled the Angara A5’s Orion upper stage and will soon install it on the rest of the rocket. The Angara A5 will roll to its launch pad a few days before liftoff, currently scheduled for next month.

The Angara A5 rocket is supposed to replace Russia’s Proton launch vehicle, which uses toxic propellant and only launches from the Baikonur Cosmodrome in Kazakhstan. Angara’s launch pads are on Russian territory. Until a few years ago, the Proton was a competitor in the global commercial launch market, but the rocket lost its position due to reliability problems, competitive pressure from SpaceX, and the fallout of Russia’s invasion of Ukraine.

Russian officials once touted Angara as a successor to Proton on the commercial market. Now, Angara will solely serve the Russian government, but it’s doubtful the government has enough demand to fill the Angara A5’s heavy launch capacity on a regular basis. According to RussianSpaceWeb.com, a website run by veteran Russian space reporter Anatoly Zak, the Russian government didn’t have any functional satellites ready to fly on the upcoming Angara A5 launch from Vostochny.

Eventually, the Angara A5 could take over the launch responsibility of the handful of large satellites that require the capacity of the Proton rocket. But this is a small number of flights. The Proton has launched three times in the last two years, and there are roughly a dozen Proton launch vehicles remaining in Russia’s inventory.

Russia plans a next-generation crew spacecraft, Orel, that officials claim will begin launching on the Angara A5 rocket in 2028. There’s no evidence Orel could be ready for test flights within four years. So, while the Angara rocket is finally flying, albeit at an anemic rate, there aren’t many payloads for Russia to put on it.

North Korean leader Kim Jong Un and Russian President Vladimir Putin visited the Angara rocket's launch pad at the Vostochny Cosmodrome last year.

Enlarge / North Korean leader Kim Jong Un and Russian President Vladimir Putin visited the Angara rocket’s launch pad at the Vostochny Cosmodrome last year.

Russia’s economic woes might explain some of the delays that have befallen the Angara program since 1992, but Russia’s space program has long suffered from chronic underfunding, mismanagement, and corruption. Angara is the only rocket Russia has developed from scratch since the 1980s, and the Russian government selected Khrunichev, one of the country’s oldest space companies, to oversee the Angara program.

Finally, in 2014, Russia launched the first two Angara test flights, one with a single-booster lightweight version of the rocket, called the Angara 1.2, and another with the heavy-lift Angara A5, made up of five Angara rocket cores combined into one rocket.

The Angara A5 can place up to 24.5 metric tons (about 54,000 pounds) into low-Earth orbit, according to Khrunichev. The expendable rocket has enough power to launch modules for a space station or deploy the Russian military’s largest spy satellites, but in 2020, each Angara A5 reportedly cost more than $100 million, significantly more than the Proton.

The smaller Angara 1.2 has flown twice since 2014, but both missions delivered functional satellites into orbit for the Russian military. The much larger Angara A5 has launched three times, all with dummy payloads. The most recent Angara A5 launch in 2021 failed due to a problem with the rocket’s Persei upper stage. The Orion upper stage set to fly on the next Angara A5 mission is a modified version of the Persei, which is itself modeled on the Block-DM upper stage, a design with its roots in the 1960s.

Essentially, the Angara A5 flight will allow engineers to test out changes to the upper stage and allow Russia to activate a second launch pad at Vostochny, which itself has been mired in corruption and delays. Medium-lift Soyuz rockets have been flying from Vostochny since 2016.

Russia’s next-generation rocket is a decade old and still flying dummy payloads Read More »

de-extinction-company-manages-to-generate-first-elephant-stem-cells

De-extinction company manages to generate first elephant stem cells

Biology, colossal, de-extinction, elephants, mammoths, Science, stem cells / /
Large collection of cells with a red outline and white nucleus.

Enlarge / Elephant stem cells turned out to be a hassle to generate. (credit: Colossal.)

A company called Colossal plans on pioneering the de-extinction business, taking species that have died within the past few thousand years and restoring them through the use of DNA editing and stem cells. It’s grabbed headlines recently by announcing some compelling targets: the tylacine, an extinct marsupial predator, and an icon of human carelessness, the dodo. But the company was formed to tackle an even more audacious target: the mammoth, which hasn’t roamed the northern hemisphere for thousands of years.

Obviously, there are a host of ethical and conservation issues that would need to be worked out before Colossal’s plans go forward. But there are some major practical hurdles as well, most of them the product of the distinct and extremely slow reproductive biology of the mammoth’s closest living relatives, the elephants. At least one of those has now been cleared, as the company is announcing the production of the first elephant stem cells. The process turned out to be extremely difficult, suggesting that the company still has a long road ahead of it.

Lots of hurdles

Colossal’s basic road map for de-extinction is pretty straightforward. We have already obtained the genomes of a number of species that have gone extinct recently, as well as those of their closest living relatives. By comparing the two, we can identify key genetic differences that make the extinct species distinct. We can then edit those differences into stem cells obtained from the living species and use that species as a surrogate for embryos produced from these stem cells. This will have to be done using stem cells from a number of individuals to ensure that the resulting population has sufficient genetic diversity to be stable.

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