Tag: spaceflight

Cruz to hold hearing on updating Outer Space Treaty

5:19 pm

Senator Ted Cruz (R-Texas) revealed today that he plans to hold a hearing next week on reviewing the Outer Space Treaty.

Sen. Ted Cruz (R-Texas) said in an on-stage interview during The Atlantic magazine’s “On the Launchpad” event here that the hearing, scheduled for May 23, would explore modifications to the Outer Space Treaty of 1967 to better enable commercial space activities. “We’ll be hearing testimony both from lawyers who have studied the issues and also from business leaders that want to expand commercial investment in space,” he said, “considering how do we update and modernize the treaty to reflect the realities of the modern world.”

He said he was concerned that the treaty, crafted at the height of the superpower space race of the 1960s, does not reflect the needs and interests of emerging commercial space companies. “The central focus of that treaty was preventing nuclear weapons in space. That’s a very good thing,” he said. “But, 50 years later, we’re in a very different environment.”

Cruz said he didn’t have specific changes to the treaty in mind. “I don’t want to start by making decisions before we hear testimony and before we think through it,” he said. He added he hoped that, like recent space-related legislation that has passed Congress, including the Commercial Space Launch Competitiveness Act of 2015, to win bipartisan agreement to pursue efforts to “modernize it to create the incentives for continued investment.”

I had sensed this might be Cruz’s next move, based on the last hearing, and it is gratifying that he is going to go forward with it.

Update: The list of witnesses can be found here. The committee webpage also says they will be focusing on Article VI of the Outer Space Treaty, which does not discuss the issue of sovereignty (Article II). Instead, Article VI says this:

States Parties to the Treaty shall bear international responsibility for national activities in outer space, including the moon and other celestial bodies, whether such activities are carried on by governmental agencies or by non-governmental entities, and for assuring that national activities are carried out in conformity with the provisions set forth in the present Treaty. The activities of non-governmental entities in outer space, including the moon and other celestial bodies, shall require authorization and continuing supervision by the appropriate State Party to the Treaty. When activities are carried on in outer space, including the moon and other celestial bodies, by an international organization, responsibility for compliance with this Treaty shall be borne both by the international organization and by the States Parties to the Treaty participating in such organization.

I begin to sense the direction this negotiation will head. Rather than claim sovereignty, they will rework this clause to allow each nation’s laws to apply to the activities of their citizens. In a sense, this is an end-around Article II.

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Mars rover update: May 15, 2017

12:31 pm

This update could also be entitled, “Up and down into Martian gullies,” as that is what both rovers, Curiosity and Opportunity, are presently focused on doing.

Curiosity

Curiosity's position, Sol 1696 (May 12, 2017)

For the overall context of Curiosity’s travels, see Pinpointing Curiosity’s location in Gale Crater.

In the past month, since my previous April 21, 2017 update, Curiosity has been working its way up the dry wash, frequently stopping to inspect the rocky surface terrain within. As they note,

As we climb up Mount Sharp, recently over slopes of 4-6 degrees, we have seen more varied outcrop structures and chemistries than the rest of the Murray formation, and such changes catch the collective eye of the team.

Only in the last week have they shifted to the east, as planned. Their near term goal is the lighter, yellowish layer of rock, dubbed the Hematite Unit, that sits higher up the slope of Mount Sharp. As they have been traveling on the Murray Formation now for more than a year, since March, 2016, I am certain the science team is even more eager to get to this different layer of geology to find out what it is made of and why it is there.

You can get an overall view of the geology Curiosity is traversing from this October 3, 2016 press release. Below is a version of the traverse map shown at that site that I posted as part of my October 6, 2016 rover update, updated to show Curiosity’s present location. It is apparent that Curiosity is finally moving out of the foothills below Mount Sharp and beginning its climb up the mountain’s actual slopes.
» Read more

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Engine test of Blue Origin BE-4 engine goes bad

9:12 am

Capitalism n space: Blue Origin today revealed that an engine test of its BE-4 rocket engine, intended for sale to ULA as well as the basis for their own New Glenn rocket, went wrong.

In a rare update, the Blue Origin space venture founded by Amazon billionaire Jeff Bezos reported that it lost a set of powerpack test hardware for its BE-4 rocket engine over the weekend, but added that such a setback is “not unusual” during development. “That’s why we always set up our development programs to be hardware-rich,” the company tweeted today. “Back into testing soon.”

The announcement was via a tweet, and they have released no additional details.

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Rocket Lab sets May 21 for first test launch of its Electron rocket

9:07 am

Capitalism in space: Rocket Lab today announced that it has scheduled the first test flight of its Electron rocket for May 21.

The company is setting expectations for a test launch that may suffer delays and could end in failure. “During this first launch attempt it is possible we will scrub multiple attempts as we wait until we are ready and conditions are favorable,” Beck said in the statement.

The launch, as the company’s name for it emphasizes [“It’s a test], is a test flight, with no satellite payload on board. The launch is the first of three such test flights Rocket Lab plans before beginning commercial launches later this year.

Rocket Lab plans to carry out the launch largely out of public view. The company said a press kit about the mission that there will be no public viewing sites in the vicinity of its New Zealand launch site for this mission. There are also no plans to webcast the launch, although the company said it will provide video footage “following a successful launch.”

Although Rocket Lab is launching from New Zealand, the company is headquartered in the United States, and thus will require a launch license from the U.S. Federal Aviation Administration for this and future Electron missions. As of May 14, the FAA had not published a launch license for this flight. [emphasis mine]

I have highlighted the last paragraph above because it is to me the most interesting part of this entire story. What happens if Rocket Lab never gets its U.S. launch license and launches anyway? They are launching on foreign soil. It really is none of the FAA’s business, even if the company is based in the U.S. Will they fine them? Call them names?

I suspect that one reason they have made the announcement first, before getting their license, is to pressure the FAA bureaucrats to get off their duffs and get moving. In the past both Virgin Galactic and SpaceX have done the same thing, and got their licenses very quickly thereafter.

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The press begins to turn against SLS

5:28 pm

This report by Eric Berger of Ars Technica, describing the press teleconference today where NASA announced that they would not fly humans on the first SLS flight in 2019, reveals a significant political change.

In the past, most mainstream reporters would routinely accept NASA’s announcements about SLS. If the agency said it was great, their stories would wax poetic about how great it was. If NASA said its greatness was causing a delay, their stories would laud NASA had how well it was doing dealing with SLS’s greatness, even though that greatness was forcing another delay. Never, and I mean never, would NASA or these reporters ever talk about the project’s overall and ungodly cost.

This press conference was apparently quite different. The press had lots of questions about SLS and its endless delays. They had lots of questions about its costs. And most significant, they had lots of questions for NASA about why the agency is having so much trouble building this rocket, when two private companies, SpaceX and Blue Origin, are building something comparable for a tenth the money in about half the time.

During the teleconference, Ars asked Gerstenmaier to step back and take a big-picture look at the SLS rocket. Even with all of the funding—about $10 billion through next year—how was the agency likely to miss the original deadline by as much as three years, if not more?

“I don’t know,” Gerstenmaier replied. “I don’t know—I would just say it’s really kind of the complexity of what we’re trying to go do, and to build these systems. We weren’t pushing state-of-the-art technology, like main engines sitting underneath the rocket or new solid rocket boosters. But we were pushing a lot of new manufacturing, and I think that new manufacturing has caused some of the delays we’ve seen. No one welds the way that we’re welding material at the thicknesses we’re welding.”

…Later, the NASA officials were asked about private companies such as SpaceX and Blue Origin, which are also building heavy-lift rockets but at a very limited cost to taxpayers. What would they have to say about just buying those vehicles off the shelf, at significantly lower cost than an SLS launch, and preserving NASA’s funds to execute in-space missions?

Gerstnmaier’s explanations for SLS’s delays and costs, that it is a very complex and advanced piece of rocket engineering, is total bunk. This was supposed to be an upgraded Saturn 5, but it will only be able to lift about 70% of the payload. It is using the actual shuttle engines, and upgraded shuttle solid rocket boosters. While new engineering was required to refit these for SLS, none of that should have been so hard or expensive.

The key here is that members of the press are finally aware of this, and are asking the right questions. With Falcon Heavy about to launched multiple times before SLS even launches once, the continuation of this boondoggle is becoming increasingly difficult to justify.

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NASA nixes plan to fly humans on first SLS flight

3:33 pm

Common sense prevails! In a joint decision with the White House, NASA announced today that they will not fly humans on the first test flight of SLS, now scheduled for sometime in 2019.

Bill Gerstenmaier, NASA associate administrator for human exploration and operations, said that the study turned up fewer technical issues with putting a crew on EM-1 than he originally expected. “What I was surprised by was that I thought there would be a whole lot of really negative work that would actually maybe make this not very attractive to us,” he said. “But when [acting NASA administration Robert Lightfoot] and I look at this overall, it does add some more risk to us, because it’s the first crew on the vehicle,” he said. The work to add crew to EM-1 would have cost NASA an additional $600–900 million, and delay the launch likely to the first or second quarter of 2020.

“The culmination of changes in all three of those areas said that overall, probably the best plan we have is actually the plan we’re on right now,” Gerstenmaier said. “When we looked at the overall integrated activity, even though it was feasible, it just didn’t seem warranted in this environment.”

The announcement also included an admission by Gerstenmaier that the first manned SLS flight, now set for 2021, will likely be delayed.

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Propellers by the dozens

12:52 pm

Propellers

Cool image time! The latest image releases from Cassini, taken during its recent close fly-by campaign of the rings of Saturn, focus on the propeller features produced in the rings by larger ring objects. The image on the right, reduced to show here, reveals dozens of propellers of all shapes and sizes.

The original discovery of propellers in this region in Saturn’s rings … was made using several images taken from very close to the rings during Cassini’s 2004 arrival at Saturn. Those discovery images were of low resolution and were difficult to interpret, and there were few clues as to how the small propellers seen in those images were related to the larger propellers Cassini observed later in the mission….

This image, for the first time, shows swarms of propellers of a wide range of sizes, putting the ones Cassini observed in its Saturn arrival images in context. Scientists will use this information to derive a “particle size distribution” for propeller moons, which is an important clue to their origins.

The parallel pattern of rings in the center of the image is a series of density waves in the ring structure, caused by an interaction with one of Saturn’s larger nearby moons.

They have also released the best view we can now expect of a propeller by Cassini.

This is the third and final propeller to be targeted for a close flyby observation during Cassini’s ring-grazing orbits (the period from Nov. 2016 to April 2017 when Cassini’s orbit passed just outside the main rings). …Because propellers are seen in the outermost parts of the main rings, the ring-grazing orbits provided Cassini’s best opportunity to see them up close.

Cassini is now diving between the rings and the planet, so the propellers are farther away.

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Air Force agreement with ULA expires

10:15 am

The 2005 agreement between the Air Force and ULA that established the ULA launch monopoly that was only broken by SpaceX in the past two years has apparently expired.

David Hardy, associate deputy under secretary of the Air Force for space, and the deputy director, principal Defence Department space advisor staff, said on 9 May that he was the compliance officer for the agreement and that the Pentagon no longer has oversight duties now that the agreement has expired. He told Jane’s these oversight duties included compliance requirements to what communications and relationships the two parent companies, Lockheed Martin and Boeing, could have with ULA, their joint venture.

It is very unclear how this will effect ULA. Will it continue to get the $800 million subsidy, as outlined by the agreement? It even appears from the article that the partnership between Boeing and Lockheed Martin might be dead.

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Two Dragon Mars missions in 2020?

7:06 pm

It appears that SpaceX is considering flying two test Dragon capsules to Mars in 2020.

NASA’s manager of science missions, Jim Green, said on Tuesday that the 2020 launch window when Earth and Mars are in favorable alignment for relatively short transits is getting crowded. Speaking Tuesday at the Humans to Mars conference in Washington, DC, Green said, “Every 26 months, the highway to Mars opens up, and that highway is going to be packed. We start out at the top of that opportunity with a SpaceX launch of Red Dragon. That will be followed at the end of that opportunity with another Red Dragon. Those have been announced by SpaceX.” NASA plans to launch a Mars lander in 2020 as well.

Two Red Dragon missions in 2020 have not yet formally been announced by SpaceX. Company spokesman John Taylor told Ars he would have to look into the question of sending two Dragons to Mars in 2020. However, other industry sources told Ars this is definitely under consideration by SpaceX, although no final decisions have been made.

That would mean two Falcon Heavy launches that year, just for this. And it would happen long before NASA manages its first launch of a complete SLS rocket.

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SLS oxygen tank dome dropped and damaged

11:46 am

You can’t make this stuff up. The dome for the oxygen tank for NASA’s SLS rocket has been accidently dropped and has been damaged beyond repair.

No details yet. It appears they can build another dome from available parts, but this will likely cause additional delays to the SLS launch schedule.

Update: More information here.

The damage was limited to the one dome section of the tank, which was not yet welded to the rest of the tank. “Assessments are ongoing to determine the extent of the damage,” she said. Henry said that the incident was classified as a “Type B” mishap. Such a mishap, according to NASA documents, covers incidents that cause between $500,000 and $2 million in damage. No one was injured, she said.

The liquid oxygen tank involved in the incident was a qualification model, intended for testing, and not flight hardware. Henry said it wasn’t immediately clear how long the investigation would take.

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Japan begins testing new rocket engine

8:40 am

Capitalism in space: Japan has begun testing the rocket engine it will use in its next generation rocket.

The H-III will succeed the country’s current H-series rockets, H-IIA and H-IIB. The rocket will use commercially available components and a fuselage that can be mass produced, lowering launch costs to about half of the current price tag of approximately 10 billion yen ($88.6 million). The new, more powerful engine will allow the H-III to carry a midsize to large satellite weighing up to 6.5 tons — 60% more than the H-IIA.

If I understand this correctly, a launch with this new rocket will cost about $45 million, which will make it very competitive with SpaceX. At the same time, it is not as powerful, which means it will not serve the exact same customer base. Instead, its capacity makes it a direct competitor to India’s GSLV Mark III rocket.

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SpaceX completes first static fire test of Falcon Heavy core stage

1:32 am

Capitalism in space: SpaceX this week successfully completed the first static fire engine test of the core stage of its Falcon Heavy rocket.

In a tweet, the company said that it completed the first static fire of the core stage of the rocket at the company’s McGregor, Texas, test site last week. The company did not disclose the precise date of the test or its duration. The company included in the tweet a video showing about 15 seconds of the test.

The Falcon Heavy uses three Falcon 9 first stages, or cores, along with an upper stage, an approach similar to United Launch Alliance’s Delta 4 Heavy. The two side booster cores for the first launch will be previously-flown Falcon 9 first stages, but the center core will be a new stage, modified to accommodate the side boosters.

The first launch is scheduled for sometime in the late summer, early fall.

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Georgia governor signs spaceport bill

8:50 am

Capitlism in space: The governor of Georgia yesterday signed into law a spaceport liability law that will make that state competitive with other states.

I’m not sure yet how realistic Georgia’s hopes are for a viable spaceport. Vector’s next test suborbital flight is scheduled to occur there, but will other companies shift their business there? I am not sure. Nonetheless, this raises the level of competition, which can never be bad.

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Brittle and weak welds on SLS tanks?

8:39 am

Government in action! The hydrogen tanks that will be used for the first SLS rocket flight were welded using a technique that NASA has since found to be untrustworthy.

Although the weld strength issue stopped welding the qualification and flight articles of the LOX tank before it could start, the issue wasn’t caught until after both LH2 tanks were welded with the modified pin tool last summer. The implications of the two tanks possibly having below design strength welds disrupted the original, post-weld plans.

The LH2 qualification tank, which will be used for structural testing at Marshall Space Flight Center in Huntsville, Alabama, was welded first and after setup and configuration was taken to Building 451 in December of last year both for proof testing of the welds and to qualify the test facility and procedures for subsequent flight tanks. Hydrogen tanks are proof tested by pressurizing them with nitrogen gas while a hydraulic test rig applies loads to the structure. “We wanted to wring out…the control system – 451 was another building that was made bigger to fit the hydrogen tank,” Doering said. “The control system is all new, the reaction fittings are all new, along with all the actuators. We didn’t want to put the flight asset in there to try to use it for the first time, so [using] the qual[ification] article [first] was also trying to wring out the pressurization and the actuation of the control system in 451.”

Originally, the plan included a test case to pressurize the qualification tank to slightly above flight pressure to help as a part of that “pathfinding” work; however, the discovery that the welds may be below design strength forced plans to be reconsidered.“We couldn’t say with any real degree of certainty that these welds would make it to [flight pressure],” Doering said. “In a pneumatic test, pressurizing it like that, it’s like a balloon…there’s a good portion of the community that thinks it will survive, there’s another portion of the community that says you don’t know enough to be able to say that, [and] there’s another portion of the community that says…’no way.’ [emphasis mine]

This is merely the qualification tank, built to find out if the tank design, which appears to be overly complicated to begin with, will work. The flight tank?

Lower pressure isn’t an option for the LH2 flight tank, which must perform at flight pressures both in testing and in flight. The SLS Program developed and is working on multiple, parallel options for consideration that include repairs and/or replacement of the already-welded flight tank. “We’re looking at use as-is – can I get to the point where I’m comfortable using that flight tank?” Doering said. “The answer to that is probably not, just because the analysis tools don’t exist yet to do this.” [emphasis mine]

They are faced with the likely possibility that they will have to repair the tank, which will likely cause the now 2019 launch date for the first unmanned test to be delayed further.

The rumors that NASA is considering making that first test flight a manned one makes me think that they are considering that decision as a cover for these additional delays. “We need more time to make this work as a manned flight,” NASA management will claim, using that extra time to fix the tanks as well. They will also claim they need more money, as they always do.

Meanwhile, NASA is having trouble building rocket tanks, an item that aerospace engineers figured out how to build half a century ago. Way to go, NASA!

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Saturn’s north pole hexagon jet stream

8:52 am

Saturn's north polar hexagon jet stream

Cool image time! The image on the right, reduced and cropped to show here, was taken by Cassini in January as it was preparing to head into its final 22 orbital dives between Saturn and its rings. The image shows the gas giant’s north polar, with all its magnificent features. As the press release notes, the north pole was in shadow for the first part of Cassini’s mission, and only in recent years has finally moved into sunlight so that the spaceship can see and image it.

Although the sunlight falling on the north pole of Saturn is enough to allow us to image and study the region, it does not provide much warmth. In addition to being low in the sky (just like summer at Earth’s poles), the sun is nearly ten times as distant from Saturn as from Earth. This results in the sunlight being only about 1 percent as intense as at our planet.

This view looks toward Saturn from about 31 degrees above the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on Jan. 22, 2017 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 939 nanometers.

Be sure to look at the full image.

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NASA may have decided to fly humans on first SLS test flight

8:32 am

Doug Messier at Parabolic Arc has a story today suggesting that there are rumors at NASA that the agency has decided that it will put astronauts in Orion for SLS’s first test flight, now tentatively scheduled for sometime in 2019.

At he notes, this will only be the second time in history humans will have flown on a untested rocket, the first being the space shuttle, where they had no choice as the vehicle needed people to fly it.

NASA’s arguments in favor of this manned test flight will probably rest on noting how much of the rocket is based on previously flown equipment. For example, the upper stage for this flight will be a modified Delta upper stage, a well tested and frequently flown stage. The first stage will be made of side-mounted first stage solid rocket boosters that are essentially upgrades of the shuttle’s solid rocket boosters. And the first stage engines are actual shuttle engines salvaged from the shuttle’s themselves. In addition, NASA will note that Orion will have a launch abort system, though it appears that there will be no test of this system prior to the flight.

These arguments don’t carry much weight. The Delta upper stage will also be modified for this flight, and this will be that version’s first use. Similarly, the solid rocket boosters have been modified as well, and this will be their first flight. And as I noted, the Orion launch abort system will not have been tested in flight.

Finally, and most important, the goal of this test flight is to see if these different parts have been integrated together properly. As a unit, none of them has ever flown together. To put humans on such a flight is very foolish indeed.

Messier sums this up quite well:

The flight might come off just fine. But, I fear that NASA’s concern about keeping the program funded, and Donald Trump’s desire for some space spectacular to boost his re-election chances, could combine to produce something very unfortunate.

I pray that people in the Trump administration put a stop to this silliness, as soon as possible.

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SpaceX to launch Bulgarian satellite in June with used first stage

8:30 pm

Capitalism in space: SpaceX will fly its second used first stage in June when it launches a Bulgarian communications satellite.

In a statement, BulgariaSat said its BulgariaSat-1 spacecraft is scheduled to launch in mid-June on a Falcon 9 from Cape Canaveral, Florida. The first stage of that Falcon 9 will be the same one that launched 10 Iridium Next satellites from Vandenberg Air Force Base in California in January. Maxim Zayakov, chief executive of BulgariaSat, said the use of a reused first stage lowers the launch price and “makes it possible for smaller countries and companies to launch their own satellites.”

The company did not disclose the price it is paying for the launch, including what discount it is receiving for using a “flight-proven” first stage.

Previously SpaceX had said it would charge about $40 million for a launch using a previously flown first stage, so I would suspect the discount is somewhere around that.

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China’s space managers now dominate China’s government

2:33 pm

Link here. The story describes how a number of prominent managers from that country’s space program have all been promoted into important political positions throughout the government.

Giving new meaning to the term high-flier, four aerospace engineers have become provincial governors in the past four years. … Until five years ago the quartet worked at either CASTC, a state-owned group that has spearheaded the technological development behind China’s ambitious space exploration programme – producing the country’s rockets, satellites and missiles – or the China National Space Administration, which is in charge of that programme.

In the past, provincial governors were predominantly selected from the ranks of those working in local government or the heads of prominent ministries. The political rise of a group with similar backgrounds has usually been linked to the power of a major faction or influential figure, such as party general secretary Xi.

People who have worked with the former aerospace engineers say the technocrats developed a cocktail of traits that appeared tailor-made to appeal to the current leadership. They did not cook the books, were willing to make necessary but unpopular decisions and were largely untainted by factional allegiances.

Their success also helps explain the increased growth of China’s space program in the past few years. These individuals are all likely to be strong supporters of that space program, and all of them are now very well placed to influence the government in favor of that program.

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Bezos sells about $1 billion of his Amazon shares

8:39 am

Capitalism in space: This past week Amazon CEO Jeff Bezos raised about $1 billion in cash by selling 1 million shares of his stock in Amazon.

Amazon.com Inc. Chief Executive Officer Jeff Bezos sold about $1 billion in company stock as part of a planned divestiture, a month after the world’s third-richest man said he spends about that amount annually on his space exploration company Blue Origin LLC.

Bezos sold 1 million shares from Tuesday to Thursday ranging in price from about $935 to $950 per share, according to a regulatory filing on Thursday. He still owns 79.9 million shares, or about 17 percent of the company, down from 83 million shares at the end of 2015.

What this means for Blue Origin is that Bezos has very deep pockets, and will likely be able to finance the development of its very big New Glenn rocket without outside help. That the company will likely also win contracts along the way for the company’s BE-4 rocket engine will also not hurt Bezos’ financial position.

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India’s GSLV rocket successfully launches communications satellite

8:28 am

India’s successfully launched a communications satellite early today using its Mark II GSLV rocket.

Friday’s launch, designated GSLV F09, was the fifth flight of the Mark II GSLV which debuted in April 2010. This replaced the Mark I, which first flew in 2001 and made its final flight at the end of 2010, introducing an Indian-developed third stage engine instead of a Russian-built engine flown on the Mark I. With this new cryogenic propulsion system, the GSLV Mk.II is a fully indigenous vehicle.

The GSLV’s service has been marred by concerns over its reliability – to date only half of its flights have been successful – however last September’s launch of INSAT-3DR saw it achieve three consecutive successes for the first time.

This launch success significantly strengthens ISRO’s ability to sell its launch services worldwide. They now have three different rocket configurations, all entirely home built, and all with a string of launch successes.

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Curiosity’s last dune investigation

5:12 pm

As Curiosity moves closer to the very base of Mount Sharp, it is presently making its last investigation of the various types of dunes found at the foot of the mountain.

From early February to early April, the rover examined four sites near a linear dune for comparison with what it found in late 2015 and early 2016 during its investigation of crescent-shaped dunes. This two-phase campaign is the first close-up study of active dunes anywhere other than Earth.

Among the questions this Martian dune campaign is addressing is how winds shape dunes that are relatively close together, on the same side of the same mountain, into different patterns. Others include whether Martian winds sort grains of sand in ways that affect the distribution of mineral compositions, which would have implications for studies of Martian sandstones. “At these linear dunes, the wind regime is more complicated than at the crescent dunes we studied earlier,” said Mathieu Lapotre of Caltech, in Pasadena, California, who helped lead the Curiosity science team’s planning for the dune campaign. “There seems to be more contribution from the wind coming down the slope of the mountain here compared with the crescent dunes farther north.”

The article also included a vague update on the status of Curiosity’s drill, out of commission since its drill feed mechanism had problems moving the drill up and down back in the fall of 2016.

Engineers are assessing how the use of vibration to deliver samples may affect the drill feed mechanism, which is used to move the drill bit forward and backwards. In addition, high winds at the linear-dunes location were complicating the process of pouring sample material into the entry ports for the laboratory instruments.

“A balky brake appears to be affecting drill feed mechanism performance,” said Curiosity Deputy Project Manager Steven Lee, of NASA’s Jet Propulsion Laboratory, Pasadena, California. “In some cases, vibration has been observed to change feed effectiveness, so we’re proceeding cautiously until we better understand the behavior. In the meantime, the engineering team is developing several methods to improve feed reliability.”

What this release does not say is whether they are any closer to solving the problem, or whether the drill is essentially out of business for the reminder of Curiosity’s life. To me, the silence on this question is deafening, and strongly suggests that they have decided the drill cannot be used, for the foreseeable future.

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3D printing of bricks, using moondust

8:45 am

European engineers have managed to print bricks using simulated moondust and focused sunlight.

The resulting bricks have the equivalent strength of gypsum, and are set to undergo detailed mechanical testing. Some bricks show some warping at the edges, Advenit adds, because their edges cool faster than the centre: “We’re looking how to manage this effect, perhaps by occasionally accelerating the printing speed so that less heat accumulates within the brick. But for now this project is a proof of concept, showing that such a lunar construction method is indeed feasible.”

The video at the link is very unconvincing. While it shows film of the printing process, it does not show film of anyone holding or manipulating the finished bricks. Instead, it shows one or two photos of finished bricks, all of which give the impression that these bricks crumble easily at the edges, I suspect that the bricks are simply too fragile for practical use.

So, is this a proof of concept? Maybe. They have at least shown that 3D printing using materials on the Moon might work.

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Cassini science team releases movie of images from first ring dive

5:25 pm

The Cassini science team has released a movie compiled from images taken during the spacecraft’s first dive between Saturn and its rings.

I have embedded the movie below the fold. It cuts off before the spacecraft’s closest approach because they took a very conservative approach to this fly-by, turning the vehicle so that its antenna dish protected it. This prevented the taking of the best images. The second dive, that occurred yesterday, will have better images.
» Read more

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The soft avalanches of Mars

9:23 am

Krupac Crater gullies

Cool image time! The image on the right, reduced in resolution to show here, shows the gullies flowing down Krupac Crater on Mars. Be sure to check out the original, released today by the Mars Reconnaissance Orbiter science team, since they have enhanced the colors to bring out the sandy flows, noting as well that while most of these gullies are found in higher latitudes, this crater at 7.8 latitude has them as well.

Although large gullies (ravines) are concentrated at higher latitudes, there are gullies on steep slopes in equatorial regions. An enhanced-color closeup shows part of the rim and inner slope of Krupac Crater located just 7.8 degrees south of the equator.

The colors of the gully deposits match the colors of the eroded source materials. Krupac is a relatively young impact crater, but exposes ancient bedrock. Krupac Crater also hosts some of the most impressive recurring slope lineae (RSL) on equatorial Mars outside of Valles Marineris.

Below I have cropped out a small section showing, at full resolution, the termination point of one of these flows, indicating where this section is on the larger image to the right. This avalanche is clearly not liquid, though it has a very sandy and soft nature, suggesting — as some scientists have theorized — that liquid from below the surface might have played a part in its flow.

It is important in looking at these images to repeatedly remind yourself that the gravity here is about one third that of Earth, and thus the angle of repose will be different, and that avalanches will behave very differently in this environment. Moreover, Mars’s far colder climate will also effect things. The avalanche we are looking at could not happen in this way on Earth.

close-up of flow

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