Tag: spaceflight

U.S. & U.K. sign space agreement

11:41 am

Anticipating the exit of the United Kingdom from the European Union, the Trump administration has signed an new space agreement with the U.K. in order to facilitate the ability of U.S. companies export British technology as well as launch from its spaceports.

I cannot find the actual text of the agreement so my description, based on news reports and the press release (linked above) might be wrong. It does appear however that the agreement is designed to smooth out the regulatory environment that might block commercial space development involving both countries.

It also seems required because of the UK’s exit from the EU. They need to sign bilateral agreements with other nations to replace the EU framework.

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SpaceX hiring engineers for building floating Starship spaceport

10:04 am

Capitalism in space: SpaceX has issued advertisements looking for two engineers to help build an offshore floating spaceport for launching its Starship/Super Heavy reusable rocket.

This plan is not really a surprise, as Musk from his first description of Starship said that it would likely launch and land on floating platforms. The rocket is big, so putting its launch and landing in the ocean reduces the risk to populated areas, while giving the company some flexibility about where it will land. The latter point reinforces the company’s stated goal of using this rocket not only to make interplanetary travel affordable but to also provide point-to-point transportation on Earth.

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Yutu-2 to resume travels after day of rest

9:58 am

The new colonial movement: After lunar day of no activity, China has reactivated its Yutu-2 rover on its 19th lunar day on the far side of the Moon.

The Yutu 2 rover had remained stationary during lunar day 18 (May 16-29), while teams back on Earth upgraded ground stations in preparation for the Tianwen-1 Mars mission, due to launch in late July or early August. Upgrades to the tracking and command facilities at Jiamusi, northeast China, and Kashi in the northwest were completed June 13 according to CLEP, meaning normal roving service can now resume.

While the rover has been stationary, the Yutu 2 science team have identified a nearby crater for examination. The 4-foot-wide (1.3 meters), 8-inch-deep (20 centimeters) crater contains reflective material which may be similar in nature to suspected impact melt glass the rover discovered last year. After checking out the crater, Yutu 2 will continue its journey northwest from the Chang’e 4 landing site. Yutu 2 has driven a total of 1,469 feet (447.68 meters) since setting down on the far side of the moon in January 2019.

Generally Yutu-2 has averaged about a hundred feet for each lunar day of actual travel.

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NOAA awards contract to private company for solar observatory

9:22 am

Capitalism in space: NOAA today awarded a contract to the private company Xplore to study development of a commercial solar observatory at the Earth-Sun L1 point.

The press release at the link is somewhat vague about the contract. It appears to be a study to see if Xplore’s proposed Xcraft spacecraft can be used as platform for such a solar observatory, not an actual contract to build the observatory.

Regardless, this award is a strong indicator that the Trump administration is applying pressure at NOAA to get it out of the business of building weather satellites and instead be a customer buying such satellites from the private sector. The weather agency has been, like NASA earlier this decade, resistant to this concept, with its bureaucracy wanting to retain control over everything. Maybe the success of SpaceX at NASA is now helping to fuel the change at NOAA.

Let us hope so. NOAA’s present fleet of solar observatories in space is years past their due date, with no sign of a replacement fleet. The agency just can’t seem to get its act together to build these satellites. For example, NOAA has been trying and failing to build a new solar observatory to monitor sunspot activity now for more than a decade.

Maybe, like NASA, giving the job to private enterprise might get things going.

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The coming final flight of the shuttle’s solid rocket booster segments

8:55 am

Link here. As NASA begins the assembly process for its first long-delayed SLS launch sometime in the next year. the article at the link outlines in detail the space shuttle history of the many reused segments used to build the rocket’s two solid rocket boosters.

All together, the Artemis I solid rocket booster segments previously helped launch 40 space shuttle missions dating back 30 years.

The oldest cylinder, which will fly as part of the booster mounted on the right side of the SLS core stage, first lifted off on the STS-31 mission with the Hubble Space Telescope on April 24, 1990. It was then used for six more shuttle flights, including Endeavour’s debut on STS-49 in 1992 and STS-95 in 1998, which lifted off with Mercury astronaut and senator John Glenn as part of its crew.

Other notable missions that are part of the Artemis 1 boosters’ legacy include: STS-71, which marked the first shuttle docking with the Russian space station Mir in 1995; STS-93, which deployed the Chandra X-ray Observatory and marked the first spaceflight commanded by a woman, Eileen Collins, in 1999; STS-114, the return to flight after the loss of the space shuttle Columbia in 2005; and STS-133, the final launch of the space shuttle Discovery in 2011.

The hardware also includes new components, including the two forward domes, two cylinders and four stiffeners.

This first SLS launch however will be the last time these segments will fly. Unlike the shuttle, NASA is making no effort to recover and reuse these boosters.

The shuttle effort to reuse these booster segments was never really very cost effective, so not reusing them on SLS might actually save money. Those savings however are chicken feed when compared to SLS’s overall cost. The problem really is with SLS’s fundamental design: cumbersome, slow, expensive, and difficult to use.

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SpaceX recovers both reused fairings from most recent launch

8:44 am

Capitalism in space: SpaceX has successfully recovered both of the reused fairings that were used in its June 13th Starlink launch.

This sets the stage for the first reuse of a fairing for the third time. The article at the link notes this important detail about these used fairings, both of which were not caught prior to landing in the ocean:

Preventing a vast majority of seawater exposure, a catch with [the ships] Ms. Tree or Ms. Chief may always be preferable for fairing reuse but the fact remains that all three successful reuses up to this point have been achieved with fairing halves that landed in the ocean. That success means that SpaceX has found a way to fully prevent or mitigate any potential corrosion that might result from seawater immersion. Given that that problem must have been a showstopper for the ~2.5 years SpaceX was able to recover – but not reuse – intact fairings, it’s safe to say that the company’s engineers have more or less solved the problem of corrosion. [emphasis mine]

In a sense we should not be surprised that the fairings were not seriously damaged by their short exposure to salt water. As designed, the shape of the fairings is essentially that of a boat hull. By landing them controlled by parachute, SpaceX guarantees that the sensitive electronics and equipment inside the fairings remains dry and untouched by salt water.

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Trace Gas Orbiter detects oxygen layer in Martian atmosphere

8:35 am

Europe’s Trace Gas Orbiter, in orbit around Mars, has detected for the first time the green atmospheric layer in Martian atmosphere caused by the interaction of oxygen and sunlight.

From what I can tell from the press release at the link, they did not “see” this green glow, they detected it spectroscopically. So, any images you see portraying it are simply artist renditions, not the real thing.

The detection is important, nonetheless. First, it confirms that there is oxygen in Mars’ atmosphere. Second, it is the first time this has been detected in the atmosphere other than Earth. Third, the detection matched closely to their computer models, suggesting that the models are a reasonable simulation of this aspect of Mars’ atmosphere.

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Next Rocket Lab launch scheduled only three weeks after last launch

8:26 am

Capitalism in space: Rocket Lab yesterday announced that its next launch is now scheduled for July 3, less than three weeks after its previous launch, the fastest turnaround the company has attempted so far.

The July launch will place seven cubesats into orbit. The fast turnaround this time is part of the company’s attempt to complete one launch per month through the rest of the year, a pace they have been promising now since 2019 but have been as yet unable to achieve.

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Cassini evidence suggests volcanoes on Titan

4:04 pm

Scientists are now proposing that. based on a close look at data and imagery of Titan from the Cassini mission archive, that this moon of Saturn might have volcanoes, and that they might even be active today.

Volcano-like features seen in polar regions of Saturn’s moon Titan by NASA’s Cassini spacecraft could be evidence of explosive eruptions that may continue today, according to a new paper by Planetary Science Institute Senior Scientist Charles A. Wood and coauthor Jani Radebaugh of Brigham Young University.

Morphological features such as nested collapses, elevated ramparts, halos, and islands indicate that some of the abundant small depressions in the north polar region of Titan are volcanic collapse craters, according to “Morphologic Evidence for Volcanic Craters near Titan’s North Polar Region” that appears in the Journal of Geophysical Research: Planets. A few similar depressions occur near the south pole of Titan. “The close association of the proposed volcanic craters with polar lakes is consistent with a volcanic origin through explosive eruptions followed by collapse, as either maars or calderas,” Wood said. “The apparent freshness of some craters may mean that volcanism has been relatively recently active on Titan or even continues today.”

The data being somewhat think, there is a great deal of uncertainty with this theory. Nonetheless, it makes perfect sense, and in fact it would be a surprise if some sort of volcanic activity was not occurring on Titan.

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Deciphering the strange geology of Mars — or anything!

10:03 am

Eroding Medusae Fossae Formation ash deposits
Click for full image.

Today’s cool image is for once not taken by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Instead, the image to the right, cropped and reduced to post here, was taken by Mars Odyssey on April 5, 2020, and shows the scouring and erosion caused by winds over many eons in a region dubbed Zephyria Planum. (Note that the image might fool your eye. Sunlight is coming from the east, and the rough terrain at the top is higher than the smooth plain at the bottom.)

Years ago, when I first started to rummage through the archives of images from the various Mars orbiters, I would have seen this image and posted it because I was completely baffled by what I saw, and thought that mystery made it worth showing to the public. Since then my incessant probing of research papers as well as asking a lot of questions of scientists has taught me a lot more about what scientists now surmise of the Martian geology. This greater knowledge in turn makes it possible for me to look at an image like this and immediately make a reasonable guess as to an explanation. This photo, while still containing much that is mysterious, is no longer completely baffling to me.

This willingness to ask questions and dig deeper is fundamental to all things. To have a deeper understanding and not simply guess about any subject, you always have to recognize that your assumptions are likely wrong, and that to learn anything you have to repeatedly ask what I call “the next question.” The first answer will force you to recognize that your first guesses are wrong, raise more questions, which in turn will lead to more questions, and then more questions, and so forth.

Whether I am researching Mars or early space history or politics, this rule always applies. Don’t leap to a conclusion. Think it possible you could be wrong. Ask the next question. And the next. You will repeatedly find that what you thought you knew was not correct, and in the end you will gain a deeper understanding of what is actually known about any subject, as well as what is unknown. And knowing the unknowns is probably the most important thing you can learn.

To gain a better understanding of today’s particular image, our first questions must start with context. Where is this feature on Mars? What is the surrounding history of that location? And what is already known about this place?

The location immediately reveals a great deal, as shown in the overview map below.
» Read more

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Interstellar suborbital launch ends in failure

10:28 pm

Capitalism in space: A suborbital launch attempt today by Interstellar, a private Japanese smallsat rocket company, failed one minute into flight, with the rocket falling into the sea.

It apparently failed at about 12 kilometers elevation, when it began tumbling. I have embedded the video of the launch below the fold, cued to just before liftoff.

This was their fifth launch attempt. Only the third launch reached their target altitude of 100 kilometers.
» Read more

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Head of NASA’s commercial program picked as chief of manned space

9:05 am

NASA’s administrator Jim Bridenstine yesterday announced that he has chosen Kathy Lueders to be the new head of the agency’s human exploration program.

In her most recent positions at NASA Lueders has been in charge first of the ISS commercial cargo program, followed by the ISS commercial crew program. She now heads the entire manned program, including Artemis.

This appointment appears to be great news for the emerging new commercial space sector (led by SpaceX), as Lueders’ close contact with them for the past half decade or so means she has seen up front the advantages of both competition and private enterprise. I suspect she will not look kindly at the endless delays at SLS and Orion, even if she has to play the political game of publicly appearing to support those projects. Like her predecessor Doug Loverro, she will be open to awarding contracts to whoever can get the job done best, rather than favoring the traditional big space contractors Boeing and Lockheed Martin, as Loverro’s predecessor Bill Gerstenmaier had often done.

NASA’s shift from being the builder of space systems to the buyer of space systems is going to accelerate.

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Successful SpaceX launch

2:38 am

Falcon 9 shortly after launch

Capitalism in space: SpaceX tonight successfully launched 58 Starlink satellites as well as three Planet earth observation satellites. The image to the right looks up at the exhaust from the nine firing Merlin engines of Falcon 9 rocket, about two minutes after launch.

That first stage also successfully landed, the third time this stage has completed a launch. The fairing halves were also reused.

The leaders in the 2020 launch race:

11 China
9 SpaceX
7 Russia
3 ULA

The U.S. now leads China 15 to 11 in the national rankings.

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Successful Rocket Lab launch

10:27 pm

Electron eleven seconds after liftoff

Capitalism in space: Rocket Lab today (June 13 in New Zealand) successfully launched five cubesats into orbit using its Electron rocket. The image to the right was taken eleven seconds after liftoff.

This was Rocket Lab’s second launch in 2020, delayed three months due to the Wuhan flu panic that shut down New Zealand. This does not put them in the leader board, but it does change the national rankings. The leaders in the 2020 launch race:

11 China
8 SpaceX
7 Russia
3 ULA

The U.S. now leads China 14 to 11 among the nations. Since SpaceX has its own Starlink launch later tonight, these numbers will likely change again before the night is over.

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Help scientists plan Curiosity’s future travels

1:27 pm

The Curiosity science team is asking the help of ordinary citizens in improving the software it uses to plan Curiosity’s future travels.

Using the online tool AI4Mars to label terrain features in pictures downloaded from the Red Planet, you can train an artificial intelligence algorithm to automatically read the landscape.

Is that a big rock to the left? Could it be sand? Or maybe it’s nice, flat bedrock. AI4Mars, which is hosted on the citizen science website Zooniverse, lets you draw boundaries around terrain and choose one of four labels. Those labels are key to sharpening the Martian terrain-classification algorithm called SPOC (Soil Property and Object Classification).

The goal is not to have citizens plan the rover’s route, but to use their judgments to refine the software that the scientists and engineers use to plan the route. This refinement will also be applicable to Perseverance when it gets to Jezero Crater in February 2021.

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Isidis Basin, on whose margin Perseverance will roam

1:20 pm

Pedestal craters in Isidis Basin
Click for full image.

Overview map

Today’s cool image to the right, cropped and reduced to post here, highlights the floor of one of Mars’ largest basins, dubbed Isidis Planitia, and located at the transition zone between the planet’s northern lowland plains and the southern cratered highlands.

The overview map below of Isidis Basin provides some context. The white box shows where this particular image is located. Jezero Crater, indicated by the red circle (which is also about the size of the crater), is where the rover Perseverance is going to land and roam come February 2021, should all go well. For scale, Isidis is about the size of the eastern half of the United States. If Chicago was located at Jezero Crater, Baltimore would be on the basin’s eastern edge, at around 4 o’clock.

This particular section of the full photo, taken on April 5, 2020 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), shows many features very typical of the floor of Isidis Basin, which also immediately reveal a great deal about its possible history.

In this small snippet we can see what at first glance appear to be pedestal craters standing up like mesas, with ordinary craters scattered about on that lower surrounding terrain. Clearly, if these are pedestal craters they had to have been created first, and then over a very long time erosion processes ate away at that plain, leaving these pedestals (which had become resistant to erosion because the impact had packed their material together and made it harder) behind as mesas.

Then, after this period of erosion was complete enough additional time was required for at least one or two rounds of cratering to occur, leaving behind the many more younger craters on the plain floor, many of which are now partly buried by dust and sand.

The problem is that these mesas are almost certainly not pedestal craters, despite their appearance. » Read more

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New Horizons sees stellar parallax

3:04 pm

New Horizons is now far enough away from Earth that its perspective of the universe shifts at least two nearby stars into slightly different positions than seen on Earth.

On April 22-23, the spacecraft turned its long-range telescopic camera to a pair of the closest stars, Proxima Centauri and Wolf 359, showing just how they appear in different places than we see from Earth. Scientists have long used this “parallax effect” – how a star appears to shift against its background when seen from different locations — to measure distances to stars.

An easy way to see parallax is to place one finger at arm’s length and watch it jump back and forth when you view it successively with each eye. Similarly, as Earth makes it way around the Sun, the stars shift their positions. But because even the nearest stars are hundreds of thousands of times farther away than the diameter of Earth’s orbit, the parallax shifts are tiny, and can only be measured with precise instrumentation. “No human eye can detect these shifts,” Stern said.

But when New Horizons images are paired with pictures of the same stars taken on the same dates by telescopes on Earth, the parallax shift is instantly visible. The combination yields a 3D view of the stars “floating” in front of their background star fields.

The resulting 3D image, available at the link, is very cool. Both stars clearly appear closer than the surrounding background stars, which of course is true as they are among the closest stars to the Sun.

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India’s first manned mission faces delays, caused by COVID-19

9:20 am

The new colonial movement: According to ISRO officials, India’s first manned mission, Gaganyaan, might have to be delayed because of restrictions imposed due to the Wuhan flu panic.

Bengaluru-headquartered ISRO (Indian Space Research Organisation) had earlier said it has planned two trial flights without crew ahead of Gaganyaan — the first one around December 2020 and the second around July 2021.

“…there are some disturbances because of COVID, but still nothing is confirmed (about delay). We need to see, still we have got some six months time. We are trying to see if we can reach there,” a senior ISRO official told P T I. He added: “There may be slight up and down (in the schedule), but that will be known only when we do the complete evaluation…it is premature to say anything, because the team that is working (on the project) has not indicated (about delay).”

The manned flight is presently scheduled for 2022. This might change.

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NASA confirms Webb launch delayed again

9:16 am

NASA officials yesterday confirmed that, due to the new work conditions and the lock down imposed by the Wuhan flu panic, the launch of the James Webb Space telescope will not occur in March 2021.

“We will not launch in March,” said Thomas Zurbuchen, the space agency’s associate administrator for science. “Absolutely we will not launch in March. That is not in the cards right now. That’s not because they did anything wrong. It’s not anyone’s fault or mismanagement.”

Zurbuchen made these comments at a virtual meeting of the National Academies’ Space Studies Board. He said the telescope was already cutting it close on its schedule before the COVID-19 pandemic struck the agency and that the virus had led to additional lost work time. “This team has stayed on its toes and pushed this telescope forward at the maximum speed possible,” he said. “But we’ve lost time. Instead of two shifts fully staffed, we could not do that for all the reasons that we talk about. Not everybody was available. There were positive cases here and there (in the surrounding area, not on site). And so, perhaps, we had only one shift.”

No new target date has been set, though the comments even hinted that they might not be able to do it in 2021.

Webb will cost 20 times more than originally budgeted ($500 million vs $10 billion) and is now more than a decade behind schedule. In the process, those overages and delays wiped out almost all of NASA’s other astronomy projects during the 2010s.

But don’t worry! Once Webb launches the task of wiping out more astronomy projects with overages and delays will be courageously taken up by NASA’s Roman Space Telescope (formerly WFIRST), already behind schedule and over budget, and it is still only in the design phase.

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Astrobotic wins contract to land VIPER rover at Moon’s south pole

9:03 am

Capitalism in space: NASA today awarded the private company Astrobotic a $199 million contract to provide the lander that place place the agency’s VIPER rover down near Moon’s south pole.

The target date for the mission is late 2023, and is intended as a scouting mission for the Artemis manned landing to follow.

During its 100-Earth-day mission, the approximately 1,000-pound VIPER rover will roam several miles and use its four science instruments to sample various soil environments. Versions of its three water-hunting instruments are flying to the Moon on earlier CLPS lander deliveries in 2021 and 2022 to help test their performance on the lunar surface prior to VIPER’s mission. The rover also will have a drill to bore approximately 3 feet into the lunar surface.

The key to this mission continues to be NASA’s shift from building things to hiring others to build them. If Astrobotic is successfully, they will then be positioned to offer their lander design to others, since it belongs to them, not NASA.

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Chinese launch and Rocket Lab scrub

11:36 pm

Electron on launchpad, June 11, 2020

Yesterday China used its Long March 2C rocket to launch an ocean observation satellite, while also testing both grid fins and a revamped fairing. The goal of the grid fins is to control the first stage’s return to Earth so that it won’t crash on top of any homes. The fairing change is to hopefully lead to their capture and reuse sometime in the future.

Late today, or actually early on June 11th, Rocket Lab tried to do its twelve commercial launch, but after three launch tries the high winds won out and they had to scrub. The image to the right shows the Electron rocket on the launchpad. If you look close, you can see the wind whipping the LOX evaporating off the rocket.

The leaders in the 2020 launch race:

11 China
8 SpaceX
7 Russia
3 ULA

The U.S. continues to lead China 13 to 11 in the national rankings.

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Fading Martian slope streaks

2:30 pm

Fading Martian slope streaks
Click for full image.

Cool image time! I’ve covered the topic of the mysterious slope streaks on Mars previously in great detail (see here and here). Essentially they are generally dark streaks (but sometimes light) that appear randomly on slopes and then fade over time. Unlike recurring slope lineae, another changing streak found on Martian slopes, the coming and going of slope streaks is not tied to the seasons. They can appear at any time in the year, and will take several Martian years to fade away.

The image to the right, rotated, cropped, and reduced to post here, was taken by the high resolution camera on Mars Reconnaissance Orbiter (MRO) on March 26, 2020. It shows numerous slope streaks down the eastern interior rim of a crater in the transition zone between the northern lowlands and the southern cratered highlands in a region dubbed Arabia Terra.

Though I can find no previous high resolution image of this crater to measure any temporal changes, you can clearly see that this slope has experienced many streaks over time, with some darker than others. The different shades suggest that the lighter streaks are older and have faded, with the darker streaks more recent events.

At the moment there is no strong consensus on the causes of these streaks. As one science paper noted, “The processes that form slope streaks remain obscure. No proposed mechanism readily accounts for all of their observed characteristics and peculiarities.” We know they occur in equatorial regions and dusty locations, and that they are triggered by some disturbance at the topmost point of the streak, which then causes a chain reaction down the slope. Other than that, the facts are puzzling, and suggest that these streaks are a phenomenon wholly unique to Mars.

The crater itself, located at 24 degrees north latitude, has some other mysteries. The features on its floor, for instance, are very puzzling. Though suggestive of the buried glaciers found in many craters in the mid-latitudes, this crater is a bit too far south. Maybe its higher altitude allows for some ice to remain here? Then again, the features on that floor might have nothing to do with ice. Maybe we are looking at sand carved by wind? Or hardened mud that was once wet?

I am merely guessing, a dangerous thing to do when one’s knowledge is limited. Then again, it’s fun, so please join in with your own guesses.

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India to give private space access to ISRO facilities

10:00 am

The new colonial movement: India’s government has announced that private commercial space companies will be given full and equal access to the facilities operated by its space agency, ISRO.

The private sector will be allowed to use ISRO’s facilities and assets and they will be provided a level-playing field in satellites, launches and space-based services, Union Minister Jitendra Singh said on Tuesday, days after the government announced opening up of the domain.

Future projects for planetary exploration and outer space travel will be open for the private sector, he added. ‘Private companies to be provided a level-playing field in satellites, launches and space-based services. Future projects for planetary exploration, outer space travel will be open for the private sector,’ he said in a statement.

If true, what this means is that if a private company builds its own rocket, it will be allowed to use ISRO’s launchpads to launch from. It also means that the government does not want ISRO to lord over those private companies.

Whether this will happen as intended however remains a question. In essence this is the same turf war between the private sector and a government-run industry that has been playing out in the U.S. Here, the private sector appears to be winning, mostly because of the effort of SpaceX. I am not sure what will happen in India, as they don’t yet have any companies like SpaceX to push the issue.

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Parker successfully completes fifth solar fly-by

9:42 am

The Parker Solar Probe has signaled scientists that it has successfully completed its fifth solar fly-by without damage.

On June 9, 2020, NASA’s Parker Solar Probe signaled the success of its fifth close pass by the Sun, called perihelion, with a radio beacon tone. The spacecraft completed the fifth perihelion of its mission two days prior, flying within 11.6 million miles from the Sun’s surface, reaching a top speed of about 244,225 miles per hour, which matches the spacecraft’s own records for closest human-made object to the Sun and fastest human-made object, set during its fourth orbit on January 29.

Mission controllers at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, received a “status A” beacon from the spacecraft at 4:40 p.m. EDT. Status A is the best of four possible status signals, and indicates that the spacecraft is operating nominally and the instrument suites are collecting science data. This beacon tone comes after a five-day period where communications with the spacecraft were not possible.

The data from this fly-by will arrive during the summer. Meanwhile, the spacecraft will next do a fly-by of Venus to slow it down further so that it can get even closer to the Sun on its next orbit.

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NASA aiming for late July/early August Dragon crew return

9:39 pm

According to statements made by NASA officials today, the agency is now targeting a late July to early August return date for the first manned Dragon.

Bob Behnken, one of the two Dragon astronauts, will likely do two spacewalks while on ISS to replace batteries on the stations main truss. In addition, they will do a number of tests of Dragon to check out its in-space long term operation.

Mission controllers planned to place the Dragon capsule into a hibernation mode, then wake up the ship’s systems to verify the spacecraft can perform its role as a quick-response lifeboat to scurry astronauts back to Earth in the event of an emergency. Mission managers are also checking data to monitor the status of the solar arrays.

It appears however that the biggest factor for determining the launch date will be weather conditions in the Gulf of Mexico. If they are good in late July mission managers might decide to return the astronauts earlier to take advantage of those conditions.

The next Dragon manned flight, carrying four astronauts, is planned in late August, thus giving NASA time to do a full assessment of this first demo flight before its launch.

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OSIRIS-REx spots sun-caused erosion on Bennu

10:08 am

Rock on Bennu showing exfoliation
Click for full figure.

An analysis of images taken by OSIRIS-REx of the asteroid Bennu has allowed scientists to identify places where the changing temperatures from day to night has caused the surfaces of rocks to flake away, a process geologists label exfoliation.

The image on the right, cropped and reduced to post here, is from figure 1 in the paper. The yellow arrow points to a typical example of exfoliation, which is a process you can see on many rocks here on Earth.

Rocks expand when sunlight heats them during the day and contract as they cool down at night, causing stress that forms cracks that grow slowly over time. Scientists have thought for a while that thermal fracturing could be an important weathering process on airless objects like asteroids because many experience extreme temperature differences between day and night, compounding the stress. For example, daytime highs on Bennu can reach almost 127 degrees Celsius or about 260 degrees Fahrenheit, and nighttime lows plummet to about minus 73 degrees Celsius or nearly minus 100 degrees Fahrenheit. However, many of the telltale features of thermal fracturing are small, and before OSIRIS-REx got close to Bennu, the high-resolution imagery required to confirm thermal fracturing on asteroids didn’t exist.

The mission team found features consistent with thermal fracturing using the spacecraft’s OSIRIS-REx Camera Suite (OCAMS), which can see features on Bennu smaller than one centimeter (almost 0.4 inches). It found evidence of exfoliation, where thermal fracturing likely caused small, thin layers (1 – 10 centimeters) to flake off of boulder surfaces. The spacecraft also produced images of cracks running through boulders in a north-south direction, along the line of stress that would be produced by thermal fracturing on Bennu.

The typical erosion processes that can cause exfoliation (weather, gravity) are not possible on tiny Bennu, so the solution appears to rest with sunlight and sunlight alone.

This is not really a surprising result, but it is the first time it has been documented by data.

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ULA on schedule for maiden flight of Vulcan in early 2021

9:49 am

Capitalism in space: According to ULA, the development program for its new Vulcan rocket remains on schedule, and will make its maiden flight in early 2021 as initially planned.

The launch will send Astrobotic’s privately built Peregrine lander to the Moon, carrying NASA science instruments.

The article provides a good overview not only of the status of construction, but also the political history that forced the development of Vulcan, that being the insistence by Congress that ULA stop using Russian engines in its rockets.

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A global map of rockfalls on the Moon

9:40 am

A global map of the rockfalls found on the Moon
Click for full resolution image.

A review of more than two million Lunar Reconnaissance Orbiter (LRO) images of the Moon has allowed scientists to compile the first global map of lunar rockfalls.

The map on the right comes from the paper. From the press release:

The result is a map of the lunar surface between 80 degrees northern and southern latitude that shows 136,610 rockfalls with diameters of more than two and a half meters. “For the first time, this map enables us to systematically analyze the occurrence and causes of rockfalls on another celestial body”, says Dr. Urs Mall from MPS.

Previously, scientists had assumed that lunar quakes in particular were responsible for the displacement of boulders. The new global map of rockfalls indicates that impacts from asteroids may play a much more important role. They are apparently – directly or indirectly – responsible for more than 80 percent of all observed rockfalls.

“Most of the rockfalls are found near crater walls,” says Prof. Dr. Simon Loew of ETH Zurich. Some of the boulders are displaced soon after the impact, others much later. The researchers hypothesize that impacts cause a network of cracks that extend in the underlying bedrock. Parts of the surface can thus become unstable even after very long periods of time.

Though the map suggests vaguely that these rockfalls are more scattered on the lunar farside and more concentrated in the mid-latitudes on the nearside, I suspect this is likely not so. If it is however it reveals something about the Moon that needs to be explained.

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NASA endorsement allows SpaceX to shift focus to Starship

9:25 am

Capitalism in space: Three different news stories today about SpaceX point out strongly the direction in which the company is heading, both in its design focus and in where it will be doing it.

First, SpaceX has informed the Port of Los Angeles that it is now definitely abandoning all plans to establish a Starship manufacturing facility there.

The company made this announcement on March 27th, which means it is not directly related to the tiff that Musk had with Alameda County officials about keeping his Tesla factory open during the California Wuhan panic lock down, which occurred in early May. Nonetheless, this decision, combined with Musk’s May 9th statement that he was going to move Tesla from California, suggests strongly that he and SpaceX is losing patience with California politics, and is likely to increasingly minimize the presence of Musk’s companies there.

This also means that the company will be expanding its Starship operations in both Texas and Florida.

In a second related story, it appears that — with the success of the first manned Dragon mission — Musk now wants SpaceX to shift its development focus entirely to Starship. Prior to that successful Dragon launch, NASA had made it clear that it did not want the company distracted by Starship, and instead stay focused on fixing any issue that might delay Dragon. As NASA is SpaceX’s biggest customer, the company was obliged to comply.

With the Dragon success however SpaceX has completed the job, so Musk now feels free to shift the company’s development teams over to Starship. And NASA is even helping him do this (today’s third SpaceX story) by agreeing at last to permit the company to use reused Falcon 9 rockets and Dragon capsules for future manned missions.

In a wholly unexpected turn of events, a modification to SpaceX’s ~$3.1 billion NASA Commercial Crew Program (CCP) contract was spotted on June 3rd. Without leaving much room for interpretation, the contract tweak states that SpaceX is now “[allowed to reuse] the Falcon 9 launch vehicle and Crew Dragon spacecraft beginning with” its second operational astronaut launch, known as Post Certification Mission-2 (PCM-2) or Crew-2.

NASA in the past was very slow to accept the use of reused capsules and rockets. It now appears they have abandoned this reluctance entirely, so much so that we could even see American astronauts flying into space on a reused rocket and in a reused capsule before the end of the year.

I want to pause to let this fact sink in. SpaceX has turned what what was considered only a few years ago as an absurd, dangerous, and wholly insane idea into the only and right way to do things.

This big endorsement of reusability by NASA also means that the agency is now willing to let SpaceX make its shift to Starship, since refurbishing rockets and capsules does not take the manpower as building new equipment.

Expect the action in Boca Chica to ramp up quite spectacularly this summer.

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