Category: Behind The Black

Seven countries join the U.S. in signing the Artemis Accords

6:06 pm

NASA announced yesterday that seven countries — the United Kingdom, Australia, Canada, Japan, Luxembourg, the United Arab Emirates and Italy — have now signed the Artemis Accords, the Trump administration’s effort to create a legal framework that will protect property rights in space and get around the legal limitations imposed by the Outer Space Treaty.

I suspect this announcement was in response to statements earlier this week by Dmitry Rogozin, the head of Russia’s space agency, that they will not partner with the U.S. in its Lunar Gateway space station project. Though Rogozin cited other issues for the decision, such at the fact that they would not be treated as an equal partner in Gateway, I suspect the decision was also made because Russia’s government opposes the Artemis Accords and does not wish to sign it. China has said the same.

Since those accords are designed to shift power and control from governments to private enterprise, it is not surprising that Russia and China oppose them. Both are authoritarian top-down societies whose government reflects their culture. To sign an agreement that would take power from the state and give it to their citizens is unacceptable.

So be it. Of the countries that have signed, I expect in future years they will all prosper in space, and eventually force others to accept the ideas of freedom, private property, and capitalism that inspire the accords. Luxombourg is committed to pushing private enterprise and investment in commercial space. The UK, Australia, Canada, and Japan all follow the same principles, and all have robust space industries that should only get stronger.

And the UAE, the new baby on the block, wants to make commercial space a big part of its future. Signing these accords — along with their peace deal with Israel — indicates strongly that they mean business, and that they are trying heartily to separate themselves from the radical Islamic movements that have been poisoning the Arab Middle East for decades.

Moreover, the U.S. is requiring any nation that wishes to participate in its effort to return to the Moon to sign these accords. These nations, and their citizens, will therefore have a chance to contribute to that effort, and likely make a lot of money in the process.

Posting is late today because Diane and I went on an 8-mile hike. My gym now idiotically requires masks while you work out, and I am certainly not going to do that. Therefore, to maintain our cardiovascular systems while strengthening our immune systems (the best defense against all flulike diseases, including the Wuhan virus), we have been doing 6 to 10 mile hikes now twice a week. It means one day a week I need to schedule some posts early, and catch up when I get home. I hope my readers understand.

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Lava cones, fissures, and channels from Olympus Mons

9:11 am

A lava cone, fissure, and channel on Mars
Click for full image.

Cool image time! The photo to the right, cropped and reduced to post here, was taken on June 29, 2020 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). In this one spot we see three obvious volcanic features, all however formed by different processes.

The location of this image is west of Olympus Mons. It sits on the vast lava plain that was laid down by that volcano, the largest in the solar system.

In order of likely occurrence, the cone probably came first. It likely indicates a past eruption coming up from below to create a small volcano.

The shallow meandering channel that sweeps around it to the north and east probably marks a later lava flow coming down from Olympus Mons.

The deeper straight fissure to the south probably came last. It is a graben, a crack caused by the uplift of the entire surface because of pressure from a magma chamber below, causing cracks to form as the surface is stretched.

Three different volcanic events, each probably taking thousands of years, with maybe thousands to millions of years between them. The context map below adds weight to the scale of time and size represented by this one Martian photo.
» Read more

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Juno science team proposes fly-bys of Jupiter’s moons

8:30 am

The Juno science team has proposed doing fly-bys of three of Jupiter’s moons, should NASA extend the mission beyond ’21.

Juno’s five-year primary mission phase ends in July 2021, and mission managers have proposed an extension that would continue operations until September 2025. The spacecraft’s additional orbits around Jupiter will bring Juno closer to the planet’s moons, allowing for a more diversified set of scientific targets.

…The moon flybys would begin in mid-2021 with an encounter with Ganymede, Jupiter’s largest moon, at a distance of roughly 600 miles (1,000 kilometers), according to Bolton.

After a series of distant passes, Juno would swoop just 200 miles (320 kilometers) above Europa in late 2022 for a high-speed flyby. Only NASA’s Galileo spacecraft, which ended its mission in 2003, has come closer to Europa.

There are two encounters with Jupiter’s volcanic moon Io planned in 2024 at distances of about 900 miles (1,500 kilometers), according to the flight plan presented by Bolton last month.

The extended mission would also allow scientists to get a better look at Jupiter’s north pole.

NASA will decide on the extension by the end of the year. From a cost and scientific perspective, it makes perfect sense to extend this mission for as long as possible. Compared to launching a new mission, extending an active one is far cheaper. It is also already in place.

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A massive Martian glacier that looks just like a glacier on Earth

2:06 pm

Massive glacier on Mars
Click for full image.

If you ever had any doubt about the existence of glaciers on Mars, today’s cool image should ease those doubts. The photo to the right, taken on August 27, 2020 by the high resolution camera on Mars Reconnaissance Orbiter (MRO) and rotated, cropped, and reduced to post here, shows many features that are appear identical to features found on typical massive glaciers on Earth.

Downhill is to the northwest. The many parallel grooves or fractures running along the length of the glacier resemble what are seen in many similar Earth glaciers. Some of these fractures are caused by the glaciers slow drift downward, with different sections moving at slightly different rates, thus causing a separation along the flow. Hence the parallel fractures.

These fractures also show evidence of some erosion. Because these Martian glaciers are no longer getting more snowfall, they are no longer growing. However, if the thin layer of dust and debris that protects the ice gets blown off or removed by motion, the ice is exposed and can then sublimate into gas so that the glacier erodes.

On the flow’s edges the darker parallel lines also resemble features seen on Earth, showing the exposed layers of the glacier’s past levels. The same thing can be seen on either side of the canyon’s walls.

The wide smooth section near the center of the parallel lines could very well be an impact crater that landed on this glacier sometime in the far past, and has since been distorted in shape as the glacier flowed downward.

If you still have doubts, the context image below, taken by MRO’s wide angle context camera, should help further allay those doubts.
» Read more

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HBO to create six-part “scripted” series on Musk and SpaceX

10:36 am

Where NOT to get your facts about SpaceX’s history: HBO today announced that it is going to create a six-part “scripted” drama series describing the history of Elon Musk and SpaceX.

In terms of story, the small-screen narrative will follow Musk as he develops the first SpaceX rocket and launches it into orbit with a handpicked team of engineers on a remote island in the Pacific. His dream of humanity colonizing the universe takes one step closer to reality with the first (and successful) manned Falcon 9/Crew Dragon mission on May 30, 2020. The participating NASA astronauts, Bob Behnken and Doug Hurley, have since returned to Earth from the International Space Station.

From my experience writing non-fiction screenplays for cable television when I was still in the movie business, I can guarantee that this drama will have very little connection to reality, and is more likely to get numerous basic facts wrong. It will thus accomplish nothing but to misinform anyone who watches it.

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Astronomers watch star’s destruction as supermassive black hole eats it

10:27 am

Astronomers, using a number of ground-based and orbiting telescopes, successfully observed a star’s destruction as it was ripped apart and eaten by a supermassive black hole at the center of a galaxy 215 million light years away.

The team carried out observations of AT2019qiz, located in a spiral galaxy in the constellation of Eridanus, over a 6-month period as the flare grew in luminosity and then faded away. “Several sky surveys discovered emission from the new tidal disruption event very quickly after the star was ripped apart,” says Wevers. “We immediately pointed a suite of ground-based and space telescopes in that direction to see how the light was produced.”

Multiple observations of the event were taken over the following months with facilities that included X-shooter and EFOSC2, powerful instruments on ESO’s VLT and ESO’s NTT, which are situated in Chile. The prompt and extensive observations in ultraviolet, optical, X-ray and radio light revealed, for the first time, a direct connection between the material flowing out from the star and the bright flare emitted as it is devoured by the black hole. “The observations showed that the star had roughly the same mass as our own Sun, and that it lost about half of that to the monster black hole, which is over a million times more massive,” says Nicholl, who is also a visiting researcher at the University of Edinburgh.

Astronomers have seen similar events previously, but never so close and never so early in the event.

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Rogozin: Russia mostly bowing out of Gateway

10:14 am

The new colonial movement: The head of Russia’s space agency Roscosmos, Dmitry Rogozin, yesterday announced during a speech at a virtual international space conference that Russia is mostly bowing out of participation in the U.S. lunar Gateway space station project, and will instead seek cooperation with China’s lunar program.

Russia apparently does not like the fact that the U.S. is insisting on taking a lead role in Gateway, and have it designed to primarily meet U.S. goals. Russia has also previously expressed opposition to the Trump administration’s insistence that any partners in Gateway sign the Artemis Accords, designed to provide legal protection for any private investment in space.

Whether they can get the deal they want from China remains very uncertain. China has made it clear they are willing to work with other partners, but China has also made it clear that they — like the U.S. — have their own goals in space, and that anything they do must serve those goals.

In his response, Bridenstine focused on the areas of agreement with Russia (establishing technical standards), but reiterated the U.S.’s commitment to the Artemis Accords. It is clear the Trump administration is fine with Russia’s decision.

For the U.S. Russia’s decision is probably a good thing. It leaves the way open to do what we want, without having to negotiate every decision. (This puts aside the issue on whether Gateway itself is a good decision.)

For Russia this announcement means they are really on their own for the first time since the Soviet era. Following the fall of the Soviet Union in 1991 Russia has largely been incapable of developing any new space project, and has needed to link its effort to the U.S. and ISS in order to be able to accomplish much of anything. Breaking free might actually benefit them, as the competition will force them to focus on their own efforts and actually achieve something.

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Blue Origin successfully completes another unmanned suborbital test flight of New Shepard

9:50 am

Capitalism in space: Blue Origin today successfully completed the seventh unmanned suborbital test flight for this particular New Shepard spacecraft/booster, landing both with no issues.

After a ten-month lull in flights following the previous test of Blue Origin’s suborbital New Shepard launch system, the company conducted a launch and landing of the fully reusable booster and capsule duo. Following weather-related and technical issues during a window late in September, the flight took place from the company’s West Texas facility — near Van Horn, Texas — on Tuesday morning at just after 8:35 AM CDT / 13:35 UTC.

This mission, also known as NS-13, saw 12 commercial payloads launched to the edge of space and back, including a NASA-developed sensor suite that could enable future lunar landing craft to perform safe and precise touchdowns on the surface of the Moon as part of NASA’s Artemis exploration program. As in the name, the NS-13 mission was the 13th test flight of the New Shepard launch system, and the first such flight of 2020.

What happens next with New Shepard remains unclear. Blue Origin officials had previously said they would do three test flights this year, with the last manned. Now it appears that manned flight will slip into ’21, but will use a new spacecraft/booster, the fourth built during New Shepard’s development.

I have embedded the video of the flight below the fold, cued to begin just before launch.
» Read more

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CDC study: Masks do nothing to stop COVID-19 infection

10:52 pm

A new CDC study shows that masks appear to have zero effect in stopping the spread of the COVID-19 virus.

An underreported, recently-published CDC study adds to the pile of evidence that cloth masks or other forms of mandated face coverings only contribute negatives to our COVID-19 problem. The study also displays — despite the constant accusations of widespread misbehavior from public health officials — that Americans are adhering to mask wearing, but mask wearing is not doing us any good.

The CDC study, which surveyed symptomatic COVID-19 patients, has found that 70.6% of respondents reported “always” wearing a mask, while an additional 14.4% say they “often” wear a mask. That means a whopping 85% of infected COVID-19 patients reported habitual mask wearing. Only 3.9% of those infected said they “never” wear a face covering.

The graph below from the study is damning. It shows that wearing a mask made no difference between those who got the disease (left column) and those in the control group.

CDC study graph: masks made no difference.

In either case, the number of cases remained the same no matter how much you wore the mask.

I suspect however that a larger study will find more infections among full-time mask wearers, especially if that study delineates between those medical professionals who are trained to wear the mask properly and with care, keeping it anti-septic, and the general public who fingers their mask continually and then sticks it in their pocket between uses.

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Bill Hammack – The Aluminum Beverage Can

6:01 pm

An evening pause: I usually like to spread out pauses from the same artist, but this video by Bill Hammack, the engineerguy, is worth seeing, even though I posted another by Hammack only a week ago.

Hat tip Jim Mallamace.

By the way, I am in great need of suggestions for the evening pause. Those that have suggested before know what to do. If you haven’t made a suggestion previously and have something you want to suggest, mention this fact in the comments below (without providing the suggestion) and I will contact you with the guidelines for making suggestions.

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After months of encouraging lockdowns WHO officials now condemn them

1:23 pm

This past weekend officials of the World Health Organization (WHO) came out to publicly condemn the policy of lock downs to limit the spread of COVID-19.

Dr. David Nabarro from the W.H.O. appealed to world leaders on Saturday, telling them to stop “using lockdowns as your primary control method” of the coronavirus.

He claimed that the only thing lockdowns achieved was poverty – with no mention of the potential lives saved.

…Speaking to Andrew Neil of the Spectator magazine, Dr. Nabarro bemoaned the collapse of the international tourism industry and claimed there would be a “doubling” in the levels of world poverty and child malnutrition by 2021 as he warned that lockdowns make “poor people an awful lot poorer.”

“I want to say it again: We in the World Health Organisation do not advocate lockdowns as a primary means of controlling this virus,” Dr. Nabarro said.

This directly contradicts the head of WHO, who since April has been advocating lockdowns.

This disagreement within WHO further highlights the uncertainty of the effectiveness of lock downs, even as those lock downs without question devastate economies.

It does appear strange however for WHO to suddenly change its position, now so close to the election. If one was cynical, one could almost suspect they are now doing this because the election is almost here and once it passes and Joe Biden wins, they will need justification for ending the lock downs.

Of course, this assumes Biden will win. I predict that if Trump wins, WHO will suddenly have second thoughts, and will once again insist that the only cure of COVID is to outlaw all economic activity, as well as any conservative protest or gathering. BLM riots however will of course be permitted, as COVID cannot spread at such events.

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Florida proves (again) the stupidity of mask mandates

12:58 pm

On September 25, 2020 the Republican governor of Florida, Ron De Santis, lifted all mandates on mask use while ending all restrictions on restaurants

He was immediately lambasted by numerous Democratic Party Florida mayors as well as:

Dr. Anthony Fauci, who warned that the change is “very concerning to me. When you’re dealing with community spread, and you have the kind of congregate setting where people get together, particularly without masks, you’re really asking for trouble.”

The mayor of Miami Beach, Democrat Dan Gelber, was especially harsh, stating in a letter to De Santis that
» Read more

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The Navy’s overreaction to COVID-19

12:09 pm

On October 10th the press breathlessly reported that “nearly two-thirds of the Navy’s deployable warships have endured COVID-19 outbreaks”.

What was not mentioned was the number of sailors killed by the outbreaks. Though the NAVY report says nothing about mortality, it does say this:

Sailor rates of infection are generally the same as the rates of infection in the local area. … Within the uniformed Navy population, roughly 35 percent of infected sailors exhibit few to no symptoms. This should build confidence in the ship’s ability to fight through outbreaks.

I strongly suspect that practically no one has died yet from coronavirus on a Navy ship. In fact, this sounds exactly like a typical flu season, where the flu quickly spreads among those confined in close quarters, but then peters out shortly thereafter, forgotten.

In other words, COVID-19 in the Navy (as elsewhere) is really nothing more than a variation of the flu, possibly more infectious to all and more harmful to the elderly sick, but harmless to practically everyone else.

The bad part of this is that, rather than let the disease play out quickly so that crews are promptly immune and the epidemic no longer can effect efficiency — as humanity has done for eons — the Navy is panicking like everyone else, instituting strict quarantines on all those infected, plus social distancing and mask rules. All this will do is prolong the agony, and interfere with the Navy’s operation. You can’t run a ship or a submarine realistically if you require everyone to keep six feet distance at all time.

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NASA charging Estee Lauder $17,500 per hour for filming its perfume on ISS

11:00 am

Capitalism in space: It now appears that NASA is charging Estee Lauder $17,500 per hour for filming the perfume that was just brought to ISS on the most recent Cygnus freighter.

The cosmetics giant will pay $17,500 per hour for the astronauts to take photos of their serum in space. Coincidentally — or not — the Space Station orbits the earth at 17,500 miles per hour.

The International Space Station is an orbiting laboratory for scientific research, but it’s the photo ops and viral videos that capture the public’s imagination.

Estée Lauder will get video and photos of their out-of-this-world product in the most photographed spot on the space station — the Cupola. The photos are not to be used in print or television advertising, but instead on social media, according to NASA. The astronauts won’t be using the product or be featured in the pictures.

The article also notes that NASA is dedicating 5% of astronaut time to commercial activities. Sooner or later I think NASA is also going to have to start paying their astronauts for this work. They deserve their share of the proceeds.

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A lunar landslide

10:03 am

Landslide on the Moon
Click for full image.

Cool image time! The image to the right was posted by the Lunar Reconnaissance Orbiter (LRO) science team on October 9, 2020, and shows a spectacular landslide almost a mile and a half long that had occurred on the interior rim of a crater on the Moon.

The top of the rim is on the left, with the landslide breaking out onto the floor of the crater on the right.

The walls of Kepler crater (30 kilometer diameter) exhibit numerous landslides. In this example, a landslide of dark material begins about 100 meters below the rim from a narrow box canyon. The box canyon is about 50 meters wide and 300 meters long. Overall, the slide is extends some 2300 meters (from the end of the canyon to its base). The base of the slide is on a fault block that lies some 1800 meters below the rim. The wall slope is about 33 degrees.

This slide is actually composed of a series of narrow landslides 20-30 meters wide. Along most of the slope, the individual slides overrun each other forming a band of debris up to about 180 meters wide. At the base of the slope, the individual slides can be recognized as they move apart forming a fan of material. A few individual isolated slides also occur adjacent to the main mass. The overlapping nature of these small slides indicate that the overall feature may have formed over a period of time, rather than all at once.

From above and at this resolution, the landslide looks almost like frozen flowing liquid. It allso looks like it began with a scattering of boulders breaking free at the top all at once that quickly consolidated into a single massive avalanche.

At the link you can zoom in or out to look at the entire image, at full resolution.

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SpaceX begins installing Raptor engines on Starship prototype #8

9:47 am

Capitalism in space: With Starship prototype having successfully passed its tank tests SpaceX has begun installing three Raptor engines in preparation for static fire tests followed by a 50,000 foot high hop.

Once the Raptors are installed, Starship SN8 is expected to undergo an extensive test program, opening with fueling tests, a spin prime test, and preburner tests, before the first Static Fire test.

That opening Static Fire test will be the first time three Raptors have been fired up simultaneously.

Once that opening Static Fire test has been completed, a data review will be conducted on engine performance and related systems – such as the Ground Support Equipment (GSE) – which will allow the nosecone to be installed on to SN8 at the launch site.

At that point the prototype will be ready for its hop. Based on the pace SpaceX is setting (and assuming all goes well), this flight should occur sometime in the next month, possibly at almost the same time as the next manned Dragon flight to ISS.

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A mile-long trail of human footprints about 12,000 years old

9:41 am

Scientists have found in New Mexico a mile-long trail of human footprints from about 12,000 years ago that was probably left by a woman and toddler.

Even more interesting, the tracks show that the woman (or male adolescent) retraced her route, without the child.

Unlike many other known footprint trackways, this one is remarkable for its length – over at least 1.5km [almost a mile] – and straightness. This individual did not deviate from their course. But what is even more remarkable is that they followed their own trackway home again a few hours later.

Each track tells a story: a slip here, a stretch there to avoid a puddle. The ground was wet and slick with mud and they were walking at speed, which would have been exhausting. We estimate that they were walking at over 1.7 metres per second – a comfortable walking speed is about 1.2 to 1.5 metres per second on a flat dry surface. The tracks are quite small and were most likely made by a woman, or possibly an adolescent male.

At several places on the outward journey there are a series of small child tracks, made as the carrier set a child down perhaps to adjust them from hip to hip, or for a moment of rest. Judging by the size of the child tracks, they were made by a toddler maybe around two years old or slightly younger. The child was carried outward, but not on the return.

There is also evidence of a mammoth and sloth crossed the tracks in-between the outward and return journey, with the sloth apparently sensing the human tracks or presence.

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Zvezda both leaking and heating up

9:23 am

A Russian news source today reported that the temperature in the ISS module Zvezda has been increasing even as air has been leaking slowly from it.

The article provides little additional detail, other than saying that “normal temperature should be restored” by today.

Why the module should be warming as it slowly leaks air is puzzling. Either way, as this is a module that has been in space for twenty years and is also a key component in the station’s operations, locating the leak is crucial. It might simply be caused by a micrometeorite hit, which can be easily patched. Or it could be caused by something more fundamental, caused by the module’s age, and thus more difficult, possibly even impossible, to fix. If so, the sooner engineers know the better.

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China’s Long March 3B launches another remote sensing satellite

11:47 pm

China today (October 11) successfully used its Long March 3B rocket to place another remote sensing satelle into orbit.

No word on whether the first stage and its strap-on boosters landed on any homes, or if they were equipped with fins to guide their re-entry.

The leaders in the 2020 launch race:

26 China
16 SpaceX
10 Russia
4 ULA
4 Europe (Arianespace)

With this launch China moves back into a tie with the U.S., 26-26, in the national rankings.

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Next manned Dragon launch delayed

11:54 pm

Because of an engine issue that caused Falcon 9 launch of a military GPS satellite to abort at T-2 seconds on October 2nd, SpaceX and NASA have decided to delay the next manned Dragon launch from October 31st “to early-to-mid November.”

The one to two week delay will give the company time to analyze the issue involving an “unexpected pressure rise in the turbomachinery gas generator” that are used to drive the rocket’s Merlin engine turbopumps.

It seems unlikely that this problem is systemic to all Merlin engines, considering the number of rocket launches SpaceX has successfully completed in the last four years. Each launch has used ten engines, with no evidence of this problem appearing previously.

At the same time, no one wants a problem on a manned flight. Better to completely understand why it happened on the GPS launch first before launching four astronauts on the rocket.

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On the radio

3:19 pm

This Sunday, October 11, 2020, from 6:00-8:00 pm (Eastern) I will be on the Task Force Gryphon radio show on Kgra Radio.

The broadcast will be live and they will be taking calls and chat questions. Feel free to call or text in. The conversation should be lively, as the host, who goes by the nom de plume of Commander Cobra, is knowledgeable, an aviation guy, and also a big fan of Behind the Black.

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More Martian pits!

2:28 pm

Pit #1
Click for full image.

Pit #2
Click for full image.

Though the number of new pictures showing pits and possible caves from the high resolution camera on Mars Reconnaissance Orbiter (MRO) has significantly tailed off in the past year, as I noted in my previous post on Martian pits in September, the pictures are still rolling in. This post will highlight five new photos and the pits therein.

The first two, on the right, are both located on the southern flanks of the giant volcano Arsia Mons, where many such pits are found. They were taken respectively on August 16, 2020 and August 27, 2020. The first was a captioned image from MRO’s science team:

In this image, the ceiling of the lava tube collapsed in one spot and made this pit crater. The pit is about 50 meters (150 feet) across, so it’s likely that the underground tube is also at least this big (much bigger than similar caves on the Earth). HiRISE can’t see inside these steep pits because it’s always late afternoon when we pass overhead and the inside is shadowed at that time of day.

What I find most interesting about both images is that the skylights do not occur where you’d expect. In image #1, the meandering rill that suggests an underground lava tube is about 1,000 feet south of the pit. The pit itself seems unrelated to that rill. In image #2, the surface shows no obvious evidence of an underground tube matching the three aligned pits. There is the hint of a narrow depression along the alignment of the three pits, but this could just as easily be evidence of wind-blown dust along that alignment.

In the full image all three pits appear to sit inside a very wide and very shallow northwest-to-southwest depression, but this is hardly certain, and regardless the three pits align in a different direction.

The overview map below provides some context.
» Read more

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Flying over Jupiter

11:02 am

Cool movie time! Using images produced by Juno in orbit around Jupiter, citizen scientist Kevin Gill has produced a very nice movie of the spacecraft’s 27th fly-by on June 2, 2020.

During the closest approach of this pass, the Juno spacecraft came within approximately 2,100 miles (3,400 kilometers) of Jupiter’s cloud tops. At that point, Jupiter’s powerful gravity accelerated the spacecraft to tremendous speed — about 130,000 mph (209,000 kilometers per hour) relative to the planet.

I have embedded the movie below the fold. The choice of a piece of music by Vangellis might seem hokey, but I think in this case it works very nicely. I also was impressed with the addition of some 3D depth near the movie’s beginning.
» Read more

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More results about Bennu from OSIRIS-REx

10:21 am

Scientists using the OSIRIS-REx spacecraft have now published a special collection of papers outlining some of their discoveries made during that spacecraft’s observations of the asteroid Bennu from February to October 2019.

These papers just make official much of what was revealed during a conference I attended in November 2019. To sum up the papers:

  • Bennu has a lot of carbonates across its surface.
  • Some of that material came from another object that had to have had water.
  • The asteroid’s boulders come in two types, dark-porous and bright-solid, with the latter likely from that water-bearing other asteroid
  • Bennu’s surface is fresh, only recently exposed to space, including the sample site Nightingale.
  • Bennu’s interior has large voids, and its equatorial region is less dense.

The discovery of carbonates, produced from the interaction of water and carbon dioxide, is a big deal. As Dante Lauretta, OSIRIS-REx principal investigator, explained at that November conference, “To me this is one of the most exciting results from the conference.”

These findings have allowed scientists to theorize that Bennu’s parent asteroid likely had an extensive hydrothermal system, where water interacted with and altered the rock on Bennu’s parent body. Although the parent body was destroyed long ago, we’re seeing evidence of what that watery asteroid once looked like here – in its remaining fragments that make up Bennu. Some of these carbonate veins in Bennu’s boulders measure up to a few feet long and several inches thick, validating that an asteroid-scale hydrothermal system of water was present on Bennu’s parent body.

The material could not have been created on Bennu itself, which means it formed on a different object that was large enough and existed long enough to create the veins in these boulders. That material was then flung back into space to settle onto Bennu’s surface.

The freshness of Bennu’s surface is also a big deal, as it means that etither the asteroid is not that old, or that its surface somehow gets plowed over periodically. It also means that when OSIRIS-REx grabs samples at the Nightingale site on October 20th, they will be grabbing material that has not been altered much by the harsh environment of space.

Finally, the data about Bennu’s interior and density is maybe the neatest discovery. As the press release notes,

The reconstructed gravity field shows that the interior of Bennu is not uniform. Instead, there are pockets of higher and lower density material inside the asteroid. It’s as if there is a void at its center, within which you could fit a couple of football fields. In addition, the bulge at Bennu’s equator is under-dense, suggesting that Bennu’s rotation is lofting this material.

Bennu’s very weak gravity makes it a very alien and hard-to-comprehend place. It appears that the gravel in this floating gravel pile is barely held together, some interlocking in a way that leaves many open gaps, with other pieces pulled outward by the spin of the asteroid.

In reading these results, my first impression was an overwhelming sense of time and its inconceivable vastness. Much of Bennu’s most primitive material comes from the early solar system, about six billion years ago. Other material is newer, but required many many millions of years to get created elsewhere, and then somehow end up in space to be captured by this asteroid.

A million years is a very long time. A billion years is a thousand times longer. To conceive such time frames and all that can happen during that time is practically impossible. Bennu has shown us just a hint of how much can happen, some of which we would never have imagined otherwise.

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