Tag: spaceflight

Rocks broken by Curiosity’s wheels contain the first pure sulfur crystals found on Mars

10:16 am

Curiosity's robot arm about to take a close look at the ground
Click for original image.

Close-up of rocks on Mars
Click for original image.

When Curiosity completed a drive on May 30, 2024, subsequent images from the rover revealed that the wheels had broken apart some small rocks, revealing very bright yellow materials not normally seen on the planet.

I posted those images on June 7, 2024 — noting that such colorful and crystal-like surface features have been rarely seen by Curiosity — and post them again now, with the top picture showing the broken rocks, labeled as “target rocks”, just after the robot arm had rotated up and away from a close inspection and imaging of those rocks. The picture to the right is a close-up taken by Curiosity’s Mars Hand Lens Imager (MAHLI), located at the end of the rover’s robot arm and designed to get close-up high resolution images of the ground that the arm is exploring. Everything in this image is tiny, in the millimeters in scale.

The science team yesterday confirmed that those unusual rocks are the first pure crystals of sulfur found on the red planet.

Since October 2023, the rover has been exploring a region of Mars rich with sulfates, a kind of salt that contains sulfur and forms as water evaporates. But where past detections have been of sulfur-based minerals — in other words, a mix of sulfur and other materials — the rock Curiosity recently cracked open is made of elemental, or pure, sulfur. It isn’t clear what relationship, if any, the elemental sulfur has to other sulfur-based minerals in the area.

While people associate sulfur with the odor from rotten eggs (the result of hydrogen sulfide gas), elemental sulfur is odorless. It forms in only a narrow range of conditions that scientists haven’t associated with the history of this location. And Curiosity found a lot of it — an entire field of bright rocks that look similar to the one the rover crushed.

Analysis of samples taken from drilling into a nearby much more structurally solid rock is presently on-going. As for theories explaining the presence of this pure sulfur, those are being worked on as well.

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Astra goes private

9:56 am

The troubled rocket startup Astra has completed a purchase deal with its original two founders, with the company becoming a privately owned company entirely owned by those two individuals.

Under the terms of the definitive agreement for the transaction (the “Merger Agreement”) that was previously announced on March 7, 2024, Apogee Parent, Inc., (“Parent”), an entity formed by Chris Kemp, Astra’s co-founder, chief executive officer and chairman, and Dr. Adam London, Astra’s co-founder, chief technology officer and director, will acquire all of the outstanding shares of the Company’s Class A common stock, par value $0.0001 per share (the “Class A Shares”) not already owned by it for the right to receive $0.50 per share in cash, as more fully described in the Merger Agreement.

With the completion of the take-private acquisition, the Class A Shares ceased trading prior to the opening of trading on July 18, 2024 and will no longer be listed on the Nasdaq Capital Market (“Nasdaq”).

Whether this deal can save the company remains unknown. It ceased launching its Rocket-3 rocket due to technical problems and the rocket’s overall small capacity, and has been very short of cash, hindering development of its proposed larger Rocket-4.

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China launches earth observation satellite

9:50 am

China today successfully launched an earth observation satellite, its Long March 4B rocket lifting off from Taiyuan spaceport in the north of China. Video clips of the launch can be seen here.

No word on where the rocket’s lower stages, using very toxic hypergolic fuels, crashed inside China.

The leaders in the 2024 launch race:

71 SpaceX
31 China
8 Russia
8 Rocket Lab

American private enterprise still leads the world combined in successful launches, 83 to 47, while SpaceX by itself still leads the entire world, including other American companies, 71 to 59.

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NASA and Boeing complete ground static fire tests of Starliner

11:20 pm

According to a press announcement tonight from NASA, the agency and Boeing have now completed the static fire tests using a Starliner ground capsule to duplicate the engine burns required to bring the in-space capsule back to Earth, carrying its two astronauts.

Teams completed ground hot fire testing at White Sands and are working to evaluate the test data and inspect the test engine. The ongoing ground analysis is expected to continue throughout the week. Working with a reaction control system thruster built for a future Starliner spacecraft, ground teams fired the engine through similar inflight conditions the spacecraft experienced on the way to the space station. The ground tests also included stress-case firings, and replicated conditions Starliner’s thrusters will experience from undocking to deorbit burn, where the thrusters will fire to slow Starliner’s speed to bring it out of orbit for landing in the southwestern United States.

Engineers now need to complete a review of those tests, followed by a full review leading to a decision as to when the astronauts will return on Starliner. No dates have yet been set, but expect these reviews to be completed within two weeks, and that Starliner will likely be scheduled for return in early August, prior to the scheduled launch of the next Dragon manned mission in mid-August.

All this assumes the FAA will clear SpaceX to resume launches before then. SpaceX is apparently ready to resume this week, but we have no indication the FAA will go along.

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Curiosity looks up Gediz Vallis as it starts its journey out

10:45 am

Curiosity panorama looking south on July 16, 2024Curiosity panorama looking south on July 16, 2024. Click for high resolution. Go here, here, here, and here
for original images.

Overview map
Click for interactive map.

Even as the Curiosity science team is beginning the rover’s journey out of the giant Martian slot canyon Gediz Vallis, they have on July 16, 2024 used its high resolution camera to gather a new mosaic of the surrounding terrain. I have used four of those images (available here, here, here, and here) to create a panorama, as shown above, focusing on the view looking south up into Gediz Vallis. Make sure you click on the image to see the full resolution version.

The overview map to the right provides the context. The blue dot marks Curiousity’s present position. The yellow lines indicate the approximate area covered by the panorama. The white dotted line indicates Curiosity’s actual traveled route, while the red dotted line the planned route.

The peak of Mount Sharp is directly ahead in this panorama, out of sight and about 26 miles away and 16,000 feet higher up. To get a sense of how far away that remains, note that Curiosity in its dozen years of exploration on Mars has so far traveled just under 20 miles and climbed about 2,500 feet.

The plan is to back track downhill and circle around the nose of the western wall of Gediz Vallis and head south in a parallel canyon that is believed to provide easier traveling for Curiosity’s damaged wheels.

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Astronomers discover an exoplanet with the most eccentric orbit so far found

9:41 am

Using the TESS space telescope, astronomers have discovered a gas giant exoplanet with the most eccentric orbit so far found, circling a star about 1,100 light years away.

On Jan. 12, 2020, TESS picked up a possible transit of the star TIC 241249530. Gupta and his colleagues at Penn State determined that the transit was consistent with a Jupiter-sized planet crossing in front of the star. They then acquired measurements from other observatories of the star’s radial velocity, which estimates a star’s wobble, or the degree to which it moves back and forth, in response to other nearby objects that might gravitationally tug on the star. Those measurements confirmed that a Jupiter-sized planet was orbiting the star and that its orbit was highly eccentric, bringing the planet extremely close to the star before flinging it far out.

Prior to this detection, astronomers had known of only one other planet, HD 80606 b, that was thought to be an early hot Jupiter. That planet, discovered in 2001, held the record for having the highest eccentricity, until now.

The exoplanet’s orbit is presently 167 days long, at its closest stellar approach dipping 10 times closer to its star than Mercury is from the Sun, and at its farthest point zipping just beyond Earth’s distance.

Computer simulations suggest that in a billion years this orbit will decay into a more circular orbit close to the star, turning this gas giant into a hot Jupiter roasted by its star continually.

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Europe’s Gaia space telescope in trouble

9:34 am

Launched in 2013 and now functioning more than six years after the completion of its primary mission to measure precisely the distances to over a billion stars, the European Space Agency’s Gaia space telescope has experienced several major technical issues this spring related to a micrometeorite hit and a failure of the electronics of one of its CCDs.

The micrometeorite hit occurred in April.

The impact created a little gap that allowed stray sunlight – around one billionth of the intensity of direct sunlight felt on Earth – to occasionally disrupt Gaia’s very sensitive sensors. Gaia’s engineers were in the middle of dealing with this issue when they were faced with another problem.

The spacecraft’s ‘billion-pixel camera’ relies on a series of 106 charge coupled devices (CCDs) – sensors that convert light into electrical signals. In May, the electronics controlling one of these CCDs failed – Gaia’s first CCD issue in more than 10 years in space. Each sensor has a different role, and the affected sensor was vital for Gaia’s ability to confirm the detection of stars. Without this sensor to validate its observations, Gaia began to register thousands of false detections.

The cause of the electronics failure remains unsolved, though it is believed related to the major solar storm that swept by at about the same time.

As a result of these issues, the telescope’s data stream will be significantly reduced. How long it will remain in operation remains unclear. At some point the cost will outweigh the amount of data obtained.

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Update on Cape Canaveral work by multiple launch companies

9:24 am

Link here. The article provides a nice summary of the construction work by Blue Origin, Stoke Space, and SpaceX at the cape, all leading to future launches and greater capabilities.

Blue Origin is still pushing for a September 29, 2024 first launch of its New Glenn orbital rocket. SpaceX is continuing work on its new Starship/Superheavy facilities as well as installing upgrades to its Falcon launchpads. The most interesting tidbit however is was about Stoke Space and its proposed Nova rocket:

The first two flights of Nova are planned for 2025, while 10 flights are planned for both 2026 and 2027. Initial flights of Nova will be expendable, with full reusability of the first and second stages coming later.

Stoke’s primary goal has been to make this rocket entirely reusable. It apparently plans to begin launching and do recovery tests as it goes until it achieves that reusability later.

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CEO of Firefly removed

9:18 am

The board of directors of the rocket startup Firefly announced yesterday that the company’s CEO, Bill Weber, “will no longer serve” in that position and has been replaced by an interim CEO.

This change is likely related to a news story the day prior about allegations that Weber had had an “inappropriate relationship” with a female employee.

Firefly has an interesting history when it comes to its CEOs. The company’s first CEO, Tom Markusic, was first sued by Virgin Galactic (his former employer) for stealing proprietary information, and then by his first Firefly investors when he got the company out of bankruptcy by making a deal with a Ukrainian billionaire. That billionaire was later forced to divest from the company by the State Department. The new investors that Markusic found then forced him out in 2022.

Who will take over now remains unknown.

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NASA cancels its VIPER payload on Astrobotic’s Griffin lunar lander

9:06 am

VIPER's planned route on the Moon
VIPER’s now canceled planned route at the Moon’s south pole

Late yesterday NASA announced it was canceling the VIPER rover that was the primary payload on Astrobotic’s Griffin lunar lander, scheduled for launch in the fall of 2025.

NASA stated cost increases, delays to the launch date, and the risks of future cost growth as the reasons to stand down on the mission. The rover was originally planned to launch in late 2023, but in 2022, NASA requested a launch delay to late 2024 to provide more time for preflight testing of the Astrobotic lander. Since that time, additional schedule and supply chain delays pushed VIPER’s readiness date to September 2025, and independently its CLPS (Commercial Lunar Payload Services) launch aboard Astrobotic’s Griffin lander also has been delayed to a similar time. Continuation of VIPER would result in an increased cost that threatens cancellation or disruption to other CLPS missions. NASA has notified Congress of the agency’s intent.

Knowing a bit of history is important to understand this decision. In the first half of the 2010s VIPER was called Resource Prospector, and was intended as an entirely NASA-built lunar lander and rover mission with a budget of about billion dollars. In 2018 however the Trump administration cancelled it as part of its decision to shift from missions designed, built, and owned by NASA to making NASA simply a customer buying products from private sector. Rather than spend a billion on one lunar lander/rover mission, NASA would use that money to buy multiple lunar landers from private companies, and put its instruments on those.

NASA then decided to repurpose the rover portion of Resource Prospector, turning it into VIPER to launch on Astrobotic’s Griffin lander. However, that project still carried with it all the problems that curse all government-designed, government-built, and government-owned projects. It had no fixed price contract but instead had the typical government unlimited checking account, and thus its costs kept rising with repeated delays in construction.

When then-NASA Administrator Jim Bridenstine revealed the project at the 2019 International Astronautical Congress, the estimated cost was $250 million. By the time NASA was ready to make a cost commitment to Congress, that grew to $433.5 million with landing in 2023. That landing date slipped to 2024 with a cost of $505.4 million. Now it has slipped again to 2025 and with a cost of $609.6 million, more than 30 percent above the commitment. That triggered an automatic cancellation review, Kearns said, which took place last month.

Some of the cause of the 2023 delay was because Astrobotic’s Griffin lander wasn’t ready either. Now however it appears VIPER still won’t be ready for the 2025 launch, even though the lander will be ready.

NASA has therefore decided to stop throwing good money after bad, and kill the rover. It however has not killed its funding for Astrobotic’s Griffin, and the mission will go forward, with the company offering its now open payload space to others. It also may use this space to fly a demonstration mission of its own proposed LunarGrid solar power system.

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A pit on the Moon reveals some really bad journalism

3:54 pm

Mare Tranquilitatis Pit

At the start of this week three different major news organizations posted articles about a so-called “discovery” of a cave on the Moon that could sustain a human colony.

What all three articles [now updated with a fourth] demonstrated however was how little research was done by the journalists who wrote the articles, as well as the lack of any editorial supervision to make sure the news organization publishing the stories didn’t look stupid.

Here are the articles in question:

The original paper that these stories are based on can be read here. It didn’t take me more than five seconds to immediately recognize that the pit in question, dubbed the Mare Tranquillitatis pit, has been known about for years. I in fact wrote about it as long ago as 2011, when researchers used Lunar Reconnaissance Orbiter (LRO) to take oblique images of it. One such image is to the right, cropped and enhanced to post here.

The new research has simply used the radar instrument on LRO to take oblique radar data to see if there are any cave passages at its base, and found that there could be voids leading off from the pit as much as “tens of meters” long, or about 100 feet or so.

This is good research, but the finding is hardly significant. Numerous other studies have suggested the same results, all tantalizing but entirely unconfirmed until we can send some probe (manned or manned) into these pits. In addition, hundreds of similar lunar pits have been documented for more than a decade.

Yet the first two articles above treated this cave as God’s gift to humanity, as if it was the first such pit found on the Moon that could hold a human base, while the third provided so little information about the background of this work that the article was essentially worthless.

I write this as a warning to my readers. Mainstream news sources no longer do the proper due diligence that should be expected from writers and editors. If you want good information, you need to go to sources that specialize in the subject (such this website), and you must go to more than one in order to understand the subject entirely.

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Layered Martian mesa inside crater

1:43 pm

Layered mesa on Mars
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and enhanced to post here, was taken on May 14, 2024 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the scientists label as a “layered butte inside small crater.”

The crater is only about 1.8 miles across, and is only a couple of hundred feet deep, at the most. Because this crater sits on a large slope rising to the southwest, the mesa’s peak is actually about thirty feet higher than the crater’s northern rim, but is still below the southern rim by about 70 feet.

A close look at the mesa’s slopes suggests about a dozen obvious layers, though based on data from the rovers Curiosity and Perseverance, those obvious layers are probably divided into many hundreds of thinner layers in between.

What caused these layers? And how did such a small crater get such a relatively large mesa in its center? As always, the overview map provides some clues, but as always it does not provide a definitive answer.
» Read more

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