Tag: spaceflight

Cassini’s last fly-by of Dionne on Monday

2:05 pm

Dionne

On Monday August 17 Cassini will make its last close fly-by of Saturn’s moon Dionne, dipping to within 295 miles of the surface.

During the flyby, Cassini’s cameras and spectrometers will get a high-resolution peek at Dione’s north pole at a resolution of only a few feet (or meters). In addition, Cassini’s Composite Infrared Spectrometer instrument will map areas on the icy moon that have unusual thermal anomalies — those regions are especially good at trapping heat. Meanwhile, the mission’s Cosmic Dust Analyzer continues its search for dust particles emitted from Dione.

The image of Dionne above is from a June 16, 2015 fly-by, The diagonal line at the top is Saturn’s rings.

After more than a decade, Cassini’s mission is in its final stages. When completed, we will have no way for decades to get close-up images of this gas giant, its spectacular rings, or its many very different moons.

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DARPA awards phase 2 space plane contracts

9:05 am

The competition heats up: The second phase contracts in the development of a reusable space plane have been awarded by DARPA.

DARPA has awarded $6.5 million each to three companies for developmental design work, including Boeing (in partnership with Blue Origin), Northrop Grumman (in partnership with Scaled Composites and Virgin Galactic), and Masten Space Science Systems (in partnership with XCOR Aerospace).

The requirements are that the plane fly 10 times in 10 days, reach Mach 10+, put a 3,000 to 5000 pound payload in orbit, and cost less than $5 million per flight. In this new phase, the companies are to deliver finalized designs by 2016, with prototype development to follow.

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NASA considers using Bigelow module for deep space missions

8:56 am

The competition heats up: Rather than build something in-house for gobs of money and decades of work, NASA is considering using Bigelow Aerospace’s largest inflatable modules for its deep space missions.

What has happened is that NASA has signed a joint agreement with Bigelow to study the possibility of using Bigelow’s B330 module as a transport habitat on long flights. The agency really has no choice, as it doesn’t have the funding to develop the necessary large spacecraft for these missions, and Bigelow can provide them to it for much less.

This description of the background of Bigelow’s inflatable modules illustrates why NASA can’t build these itself:

The B330 evolved from the Genesis I and II modules that Bigelow Aerospace had launched into space. Those technology demonstrators were born out of the NASA project known as TransHab. The TransHab was an inflatable module designed for the ISS but was ultimately cancelled in 1999 due to budget constraints. The module would have provided a 4 level 27.5 feet (8.4 meter) diameter habitat for the astronauts.

After TransHab was cancelled, Bigelow worked with NASA on a technology transfer, giving Bigelow Aerospace exclusive rights to the technology. Using this technology, Bigelow designed, built and launched two technology demonstrators. They are still on orbit today. Genesis I was launched in 2006 with it’s sister ship launching in 2007. Both ships tested flight operations processes and on-board electronics and have performed above design specifications. [emphasis mine]

Unlike NASA, as a private company Bigelow was able to build this technology quickly and at a low cost. With the new agreement, the goal will be study the operation of a B330 in independent flight in low Earth orbit. Whether an actual B330 will be build and launched however is not yet clear.

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The Space Show modernization crowd-funding campaign

12:52 pm

For more than a decade David Livingston has been producing and hosting The Space Show, the aerospace industry’s most important outlet for telling the public what is happening in space.

Now David is starting a crowd-funding campaign to finance a major update to The Space Show archives, in order to make them fully searchable and thus accessible to historians and researchers. As he notes,

Our archives as of this morning contain 2, 524 interview programs. These interviews tell the story of the space industry as many guests were there when it started, when we went to the Moon, and even before SpaceX was started. But as it stands, nobody can search our archives for information, program content, breaking news, etc. The closest one can come to a search is the GuestSearch tool on our current website, but searches are not interactive and about two-thirds of our programs have no key words so a search using the GuestSearch tool is not very useful Space Show archives are a treasure of information and history. By making them fully searchable and of archival quality, everyone benefits, even the casual Space Show listener.

As a space historian, I think David’s effort here is essential. The data hidden in the Space Show archives is invaluable, describing the beginning of the commercial space industry better than any other source. Making it searchable would make this history available to future generations that otherwise would never see it.

Check out the campaign as well as the Space Show support site and contribute. Not only can you help future space historians you will help keep the Space Show on the air.

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Contract to build upgraded Vega rocket signed

9:58 am

The competition heats up: The European Space Agency today signed a contract to develop an upgraded version of its Vega rocket.

With respect to the VEGA configuration currently in operation, VEGA C aims to increase the load capacity of the orbital launcher up to 50%. Together with a further increase in operational flexibility, while maintaining its unrivalled orbital precision, it is expected to expand the capability to transport in the same flight a larger number of small satellites, in different orbital planes, or larger satellites. The new version of VEGA will be flight qualified in late 2018 for an entry into service as early as 2019. The group of countries which already participated in the development of VEGA, with Italy playing a major role with a 65% participation, welcomes now the entry of Germany.

I get the impression from this article that Vega is being used by ESA to spread the pork around, since to get Ariane 6 built they had to agree to not do so and give the work and control entirely to Airbus Safran. I thus wonder how competitive Vega will truly be.

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Orbital ATK orders second Atlas 5 for launching cargo to ISS

9:43 am

In the heat of competition: Even as it has accepted delivery of two new Russian engines to power its Antares rocket, Orbital ATK has ordered a second Atlas 5 rocket to launch its Cygnus cargo capsule to ISS.

I suspect they want to give themselves some cushion time to test and install these new Russian engines prior to an actual launch. In order to fulfill their contract with NASA, however, they have to launch several times next year, thus requiring more replacements for Antares.

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Where is Pluto’s nitrogen coming from?

9:28 am

As New Horizons’ engineers download data and plan future maneuvers to fly past one of two candidate Kuiper Belt objects, the science team today outlined the background mystery of Pluto’s nitrogen.

Pluto’s atmosphere is similar to Earth’s in that it is predominantly composed of nitrogen (N). But Pluto’s atmosphere is ~98% N, while Earth’s is only ~78% N. Pluto’s atmosphere is also considerably thinner than Earth’s with ~10,000 times lower pressure at the surface.

The nitrogen in Pluto’s atmosphere (in the form of N2 gas) is actually flowing away and escaping the planet at an estimated rate of hundreds of tons per hour. We also see what looks like flowing ice on Pluto’s surface in high resolution images made by New Horizons. The water ice (H2O) that we are familiar with on Earth would be completely rigid and stiff at Pluto’s surface temperatures, but ice made out of N2 would be able to flow like a glacier. So where does all of this nitrogen come from?

They have rejected comets as a source, and have predicted that geologic activity on Pluto itself could dredge the nitrogen up from the planet’s interior. (This prediction by the way was made before the New Horizons’ flyby, which has proved it likely.)

If their theory ends up the answer, then they will also prove that Pluto is losing mass, albeit slowly. Nitrogen from within is being processed out of the interior, into the atmosphere as gas, and then into space because Pluto’s gravity is too small to hold it.

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Ten years after the Russians did it, NASA finally produces lettuce in space

9:29 am

Lots of news stories today about yesterday’s lettuce feast on ISS, where a Japanese and two NASA astronauts chowed down on lettuce grown in a NASA-built space greenhouse, ten years after the Russians did it with the American-built and still working LADA greenhouse.

Almost all the stories below, however, fail to note that earlier effort, and instead make the false claim that this NASA experiment is the first to grow lettuce in space.

Only the last article, written at an alternative space news website normally focused on the collection of space memorabilia, gets it right, noting that the Russians did it more than a decade ago and have since then been regularly growing lettuce, peas, and radishes on ISS — and eating them. (They also link to the 2003 Air & Space article I wrote on this very subject.)

Meanwhile, take a scan of all the important mainstream news outlets above, none of whom did the slightest bit of research or fact-checking so they could find out that NASA’s experiment now is not the first, and in fact is more than a decade behind an earlier co-operative effort between the Russians and Utah State University.

This should make you wonder if maybe their other news research is as sloppy.

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Update on Boeing’s CST-100

8:55 am

This article provides an update on the status of the construction of Boeing’s CST-100 manned capsule.

It also describes NASA’s lobbying effort with Congress to get the full budget it had proposed for the construction of the commercial crew spacecraft.

I note instead the apparent bureaucratic focus of all the work Boeing seems to be doing.

Following the CBR [Certification Baseline Review], Boeing successfully completed the Ground Segment CDR (Critical Design Review) on 4 December 2014 before moving onto the Phase 2 Safety Review (Part B) in early January 2015. By mid-March, Boeing completed the Phase 2 Safety Review (Safety Technical Review Board Readiness) and moved on to the Delta Integrated CDR, which took place on 27 March 2015.

Since then, Boeing has spent the summer months conducting the Phase 2 Safety review (STRB 80%) as well as producing the CDR for the launch elements of the program and the Qualification Test Article Production Readiness Review.

Moreover, in late July, teams at the Kennedy Space Center began building the Structural Test Article (STA) for the CST-100 capsule inside former Orbiter Processing Facility bay 3 (OPF-3).

Lots of reviews, but notice in the last paragraph they have only begun building the first capsule. As much as these reviews might help them make sure they are doing things right, they seem to create a situation where the company is able to slow-walk construction to help NASA with its congressional lobbying effort, while simultaneously making it sound like they are accomplishing a lot.

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Sudden outburst activity on Comet 67P/C-G

8:38 am

jet on Comet 67P/C-G

Cool image time! As Comet 67P/C-G approaches perihelion, Rosetta is detecting and imaging more and more activity coming from the nucleus, including a power outburst lasting less than a half hour.

In the approach to perihelion over the past few weeks, Rosetta has been witnessing growing activity from Comet 67P/Churyumov–Gerasimenko, with one dramatic outburst event proving so powerful that it even pushed away the incoming solar wind.

The comet reaches perihelion on Thursday, the moment in its 6.5-year orbit when it is closest to the Sun. In recent months, the increasing solar energy has been warming the comet’s frozen ices, turning them to gas, which pours out into space, dragging dust along with it.

The three pictures above were taken 18 minutes apart. The first shows nothing, and in the last the jet has almost completed dissipated. In the middle image, however, the jet is well defined, and data from the spacecraft indicated that it was so strong that it “had pushed away the solar wind magnetic field from around the nucleus.”

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The mobile launch building at Vostochny

8:27 am

At their new spaceport at Vostochny, the Russians are building a moveable launch building that will enclose their Soyuz rockets prior to launch.

Painted in elegant blue and white and standing almost 50 meters high, the Mobile Service Tower, MBO (for Mobilnaya Bashnya Obsluzhivaniya), is designed to provide personnel access to the Soyuz rocket during the countdown to liftoff from its launch pad in Vostochny. The structure can be also used to service the pad after launch and to process the rocket in case of an aborted liftoff.

With the tower in place, technicians can easily reach practically any part of the rocket as high as 37 meters above the surface of the launch pad. Internal access bridges of the tower surround the upper portion of the first and second stage, the third stage and the payload fairing.

The article also notes that “for decades, Soviet soldiers and officers and later their Russian civilian successors had to brave winter cold and summer heat preparing Soyuz rockets for launch on open-air gantries in Baikonur and Plesetsk. But in a sign how times have changed, the new generation of rocketeers will be protected from snow and rain with a climate-controlled tower completely enclosing the Soyuz rocket before liftoff from its newest launch pad at Russia’s Vostochny Cosmodrome.”

The irony here is profound. Big moveable buildings is how NASA has been doing it since Apollo. It is also what Boeing’s Delta family of rockets uses at Vandenberg in California. It is also why the Saturn 5 was and the Delta is so expensive to launch.

SpaceX abandoned such complicated structures in designing its Falcon 9, and instead decided to copy the old Soviet method of simple buildings for horizontal assembly and the simple horizontal transport to the launchpad. This appears to save a lot of money while simplifying rocket assembly.

That the Russians are now copying NASA’s more expensive but fancy mobile building approach means that, once again, their government is making decisions not based on efficiency but the prestige their political decisions can give them. From a competitive perspective, this is not going to benefit the Russia space effort, in the slightest.

But their workers will be more comfortable while they assembly those rockets!

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Scientists narrow the next Mars rover candidate landing sites to 8

9:13 am

Jezero Crater

For the next Mars rover, scheduled to launch in 2020, scientists have now narrowed their candidate landing sites to eight, with Jezero Crater (pictured on the right) the favorite choice.

The top vote getter was Jezero crater, which contains a relic river delta that could have concentrated and preserved organic molecules. “The appeal is twofold,” says Bethany Ehlmann, a planetary scientist at the California Institute of Technology (Caltech) in Pasadena. “Not only is there a delta, but the rocks upstream are varied and diverse.”

The image clearly shows the scientific attraction of Jezero Crater, with an obvious meandering river canyon opening out into an obvious river delta. The crater in the delta will also give them an opportunity to do some dating research, since that crater had to have been put there after the delta was formed.

The choice however illustrates the difference in goals between scientists and future colonists. Scientists are looking for the most interesting locations for understanding the geological history of Mars. Future colonists want to find the best places to establish a home. Jezero Crater, as well as the other eight candidate sites, do not necessarily fit that settlement need. For a colonist it might be better to put a rover down on the flanks of Arsia Mons, one of Mars’ giant craters where scientists have evidence of both water-ice and caves. None of the candidate sites, however, are aimed anywhere close to this volcanic region, because scientifically it is not as interesting.

This is not to say that the candidate sites might not be good settlement sites. It is only to note that the focus of these scientists is research only. Furthermore, it is probably premature anyway to look for settlement sites. We need to know more about Mars itself.

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Stratolaunch shifts to the small sat market

5:07 pm

The competition heats up: Even as Vulcan Aerospace, the company building the Stratolaunch air-launch system, considers its options for the second stage rocket that it will use, it has decided to shift its focus towards the small satellite market, including cubesats.

In a sense, they are now aiming at the same cubesat/smallsat market that Virgin Galactic wants with its LauncherOne air-launched rocket. Whether they can build a system cheap enough for these small satellites to afford, however, remains the big question. Their shifting focus, like Virgin Galactic’s, does not bode well for them.

Stratolaunch of Huntsville, Alabama, has already gone through two earlier iterations of its launch vehicle. When Stratolaunch unveiled its plans in December 2011, it planned on using a variant of SpaceX’s Falcon 9 rocket. Less than a year later, though, Stratolaunch announced it was ending that agreement because SpaceX wanted to focus on the standard version of its Falcon 9.

Stratolaunch then teamed with Orbital Sciences Corp., now Orbital ATK, to develop a launch vehicle. That rocket, called Thunderbolt, featured two solid-fuel stages provided by ATK and an upper stage powered by RL-10 engines from Aerojet Rocketdyne. Like the earlier SpaceX design, Thunderbolt was designed to launch medium-class payloads.
Chuck BeamesChuck Beames. Credit: Vulcan Aerospace

Stratolaunch, though, has set that design aside as it seeks to launch smaller satellites, where the company sees a burgeoning market.

One wonders if the cost of building Stratolaunch will be more than this smallsat market can bear.

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Russia delivers to Orbital ATK the first two new Antares engines

9:15 am

Even as Orbital ATK begins to wrap up their investigation into the October launch failure of their Antares rocket, Russia delivered on July 16 the first two new replacement engines.

The RD-181 motors will be used in the first stage of the rocket. They will replace aging AJ-26 engines the company decided to stop using after one of them exploded during a launch last October. The AJ-26s are revamped NK-33 engines left over from the Soviet Union’s manned lunar program.

The first launch of the revamped Antares booster is set for next March. The rocket will carry a Cygnus cargo ship bound for the International Space Station.

Though these Russian new engines will allow Orbital to get Antares back into operation, they do limit that rocket’s marketability in the U.S.

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NASA extends Russian crew ferry contract through 2019 for $490 million

8:09 pm

Lobbying Congress: Claiming that the unwillingness of Congress to fully fund its effort to build commercial manned space ferries, NASA announced today that it has extended its contract with the Russians through 2019, at a cost of $490 million.

For the next fiscal year, House Republicans have proposed allocating nearly $250 million less than the request, while Senate Republicans would offer $300 million less. If Congress doesn’t increase the allocation, Boeing and SpaceX likely will receive orders to immediately suspend all operations either next spring or summer, Bolden said. And if those orders are issued, Bolden said the existing contracts “may need to be renegotiated, likely resulting in further schedule slippage and increased cost.”

According to this article, the extension has also increased the cost per astronaut flight from $71 to $82 million.

The irony here is that I do not believe Congress’s cuts to this program have slowed SpaceX’s effort down in the slightest. I expect that, barring more flight failures or orders from NASA to stop work, they could fly their first manned Dragon flight by 2017.

Boeing however is probably dragging its feet, since it really isn’t that much interested in achieving manned flight as much as squeezing cash out of Congress. It is probably thus eagerly working with NASA in this lobbying effort.

Meanwhile, the Republican idiots in Congress are claiming — falsely — that these cuts are forced on them by sequestration. This is a lie, as they have, at the same time they have cut commercial crew, increased the budget for SLS. If they were really interested in serving the needs of the nation they would have cut SLS, which can’t accomplish anything and is a terrible waste, and sent the money to commercial crew instead.

But then, who said they were interested in serving the needs of the nation? It doesn’t appear that way to me.

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Curiosity looks ahead at its future travels

2:17 pm

The future terrain at Mt Sharp

Cool image time! The above image is a cropped version of a full resolution image taken by Curiosity of the terrain the rover will be traveling in the coming years.

I have also enhanced the contrast slightly to bring out the details. The terrain is rugged and very diverse, from rounded buttes to rocky outcrops.

Gravel and sand ripples fill the foreground [not shown in my cropped version above], typical of terrains that Curiosity traversed to reach Mount Sharp from its landing site. Outcrops in the midfield are of two types: dust-covered, smooth bedrock that forms the base of the mountain, and sandstone ridges that shed boulders as they erode. Rounded buttes in the distance contain sulfate minerals, perhaps indicating a change in the availability of water when they formed. Some of the layering patterns on higher levels of Mount Sharp in the background are tilted at different angles than others, evidence of complicated relationships still to be deciphered.

Traversing this rugged terrain will be a challenge but it is necessary to obtain data that will help decipher its origins. The immediate goal will be to reach the light brown terrain in the distance. In the full image, that region gently slopes upward to the left to the mountain summit, providing a route to the rover’s eventual goal.

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Airbus patents design for a supersonic ramjet airplane

8:55 am

The competition heats up: Two Airbus engineers have gotten a patent for a supersonic jet that would use suborbital space engineering, including hydrogen-oxygen engines as well as a ramjet, to fly at 20 to 30 miles elevation.

On a typical flight, it would take off like a conventional plane using ordinary turbojet engines, but once in the air, an open door in the stern of the plane reveals a rocket motor. When this fires, it sends the aircraft into a near vertical trajectory, accelerating it to supersonic speeds.

As the airplane approaches Mach one, the turbojets shut down and retract into the fuselage. On completion of the acceleration phase the plane is now flying at anywhere from Mach 4 to Mach 4.5 at an altitude of 30,000 to 35,000 m (100,000 to 150,000 ft). The rocket motor shuts down and is again concealed as the aft door slides shut to reduce drag. A ramjet now kicks in and the aircraft cruises along its flight path and can cover a range of 9,000 km (5,600 mi) in three hours – the equivalent of Tokyo to Los Angeles or Paris to San Francisco. Meanwhile, the wing fuselage design dissipates the sonic shock wave over 110 to 175 km (68 to 109 mi) and angles it at 11 to 15 degrees so it doesn’t reach the ground. At the end of the journey, split flaps reduce speed and the turbojets take over for approach and landing.

As the article notes, it is unlikely this jet will ever be built, as patented. The patent however illustrates the growing interest by commercial operators of these radical aerospace designs. While this specific design might never fly, many aspects of it are going to start appearing in flying ships in the next few decades.

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Orion might not be ready for 2018 test flight

8:42 am

Government in action! Last week NASA admitted that the Orion capsule and its service module might not be ready for its 2018 test flight.

Bill Gerstenmaier, head of NASA’s human spaceflight directorate, told members of the [NASA Advisory Council’s human exploration] subcommittee the Orion capsule’s European-made service module, which is being developed by Airbus Defense and Space, will probably be the last piece of the critical test flight to be ready for launch.

NASA and ESA officials, together with contractors from Orion-builder Lockheed Martin and Airbus, have discussed shipping the Orion service module from Europe to NASA’s Kennedy Space Center in Florida before it is finished. European engineers could travel to the Florida spaceport to complete construction of the service module before its integration with the Orion crew capsule, which is to be assembled by Lockheed Martin at KSC’s Armstrong Operations and Checkout Building.

Engineers plan to introduce changes to the Orion crew module after a successful orbital test flight in December 2014. The upgrades include a switch from a monolithic heat shield made of ablative Avcoat material to blocks of Avcoat, a change intended to improve the manufacturability of the thermal protection system. [emphasis mine]

I have highlighted the last paragraph above because it is written to give the false impression that the decision to change the heat shield resulted from the December 2014 test flight. The truth is that NASA had already decided to change heat shields before the test flight. Why NASA engineers are still “planning” to introduce these changes illustrates why government operations are absurdly wasteful.

Orion was first proposed by President George Bush in 2004. The first Orion contract was awarded in 2006. It is now a decade later, and NASA is suddenly warning us that they might not get a single capsule and service module built by 2018, 12 years after construction began. During that time they have spent approximately a billion dollars per year on Orion. For what?

Kennedy proposed going to the Moon in 1961. Eight years later Americans were walking there. Pearl Harbor was attacked on December 7, 1941. The U.S. completed the total defeat of Germany, Italy, and Japan in slightly more than three years, by the spring of 1945.

Today’s NASA however can’t get a single capsule and service module built in 12 years. The contrast is striking. Anyone with the slightest bit of common sense would say that with a track record like this, this program should be shut down now.

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NASA considers offering SLS for commercial payloads

9:13 am

Squelching the competition: NASA is pushing to redesign its expensive and giant Space Launch System (SLS) rocket so that it can be used to launch commercial, military, and scientific payloads as well as proposed manned exploration missions.

At the moment, SLS has no planned payloads or funded flights past its second test flight in 2021. The system is very expensive, however, and the only way other customers could afford it would be if NASA charges them far less than the actual cost to fly. In such circumstances, NASA would essentially be subsidizing SLS so that it could compete, even undercut, private commercial rockets that actually cost far less.

If NASA does this, they could very well squelch the emerging private commercial launch industry.

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Alan Stern gives the IAU a piece of his mind

9:39 am

New Horizons’ principle investigator yesterday told the International Astronomical Union what he thinks of their definition of a planet:

“It’s bulls—,” he told Tech Insider (and said we could quote him on that).

The problem, Stern said, is that the reclassification largely stemmed from the opinions of astronomers, not planetary scientists. His beef here is that astronomers study a large variety of celestial objects and cosmic phenomena, while planetary scientists focus solely on planets, moons, and planetary systems.

“Why would you listen to an astronomer about a planet?” Stern said. He compared it to going to a podiatrist for brain surgery instead of a brain surgeon. “Even though they’re both doctors, they have different expertise,” Stern said. “You really should listen to planetary scientists that know something about this subject. When we look at an object like Pluto, we don’t know what else to call it.”

Stern’s opinion is not unique among planetary scientists. I have interviewed many, and read reports by others, which consistently say that they object strongly to the IAU’s definition. To them, if a object has enough mass to force it into a sphercial shape, it is a planet.

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Philae results published

9:32 am

Cool image time! The Philae science team yesterday published in Science a set of papers describing their results from the lander’s approach and bouncing landing on Comet 67P/C-G.

Data were obtained during the lander’s seven-hour descent to its first touchdown at the Agilkia landing site, which then triggered the start of a sequence of predefined experiments. But shortly after touchdown, it became apparent that Philae had rebounded and so a number of measurements were carried out as the lander took flight for an additional two hours some 100 m above the comet, before finally landing at Abydos.

Some 80% of the first science sequence was completed in the 64 hours following separation before Philae fell into hibernation, with the unexpected bonus that data were ultimately collected at more than one location, allowing comparisons between the touchdown sites.

The images from lander so far released show the approach to the first site, with one boulder getting larger and larger as it descends, followed by images at the final landing site, showing a fractured, uneven, and very rough surface with the lander apparently sitting sideways with one foot off the ground.

An animation of the first touchdown, created by these images, can be viewed here.

Update: A good summary of the results can be read here.

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Kazakhstan gets a cut rate deal from Russia

8:42 am

It’s who you know: Russia has sold Kazakhstan Sarah Brightman’s space tourist seat at a price more than a third less than it charges NASA.

Kazakhstan will pay a mere $20 million to send an astronaut to the International Space Station on a Russian rocket — less than half the sum reportedly asked of a British passenger to make the same trip and less than one-third of the price routinely paid by NASA for U.S. astronauts, news agency RIA Novosti reported Wednesday, citing a Kazakh space agency official.

Tourists pay somewhere around $35 million while NASA pays $75 million. Kazakhstan, however, owns Russia’s spaceport Baikonur, so they have some leverage in the negotiations. Moreover, there are hints that it won’t have to lay out any cash at all, and that the fee will simply be deducted from the $115 million annual rent that Russia pays.

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Puzzling red arcs on the Saturn moon Tethys

10:44 am

Red arcs on Tethys

Baffling image time! Images taken in April 2015 by Cassini of the Saturn moon Tethys have produced the best images yet of the puzzling red arcs on the moon’s surface, first identified in 2004.

The origin of the features and their reddish color is a mystery to Cassini scientists. Possibilities being studied include ideas that the reddish material is exposed ice with chemical impurities, or the result of outgassing from inside Tethys. They could also be associated with features like fractures that are below the resolution of the available images.

Except for a few small craters on Saturn’s moon Dione, reddish-tinted features are rare on other moons of Saturn. Many reddish features do occur, however, on the geologically young surface of Jupiter’s moon Europa. “The red arcs must be geologically young because they cut across older features like impact craters, but we don’t know their age in years.” said Paul Helfenstein, a Cassini imaging scientist at Cornell University, Ithaca, New York, who helped plan the observations. “If the stain is only a thin, colored veneer on the icy soil, exposure to the space environment at Tethys’ surface might erase them on relatively short time scales.”

I could also file this under “the uncertainty of science”, as the scientists at this point haven’t the slightest idea what created these arcs.

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How Comet 67P/C-G interacts with the solar wind

9:19 am

Accumulating data from Rosetta is now giving scientists an excellent picture of how this comet interacts with the solar wind as it moves in towards its closest approach to the Sun.

They have seen that the number of water ions – molecules of water that have been stripped of one electron – accelerated away from the comet increased hugely as 67P/C-G moved between 3.6AU (about 538 million km) and 2.0AU (about 300 million km) from the Sun. Although the day-to-day acceleration is highly variable, the average 24-hour rate has increased by a factor of 10,000 during the study, which covered the period August 2014 to March 2015.

The water ions themselves originate in the coma, the atmosphere of the comet. They are placed there originally by heat from the Sun liberating the molecules from the surface ice. Once in gaseous form, the collision of extreme ultraviolet light displaces electrons from the molecules, turning them into ions. Colliding particles from the solar wind can do this as well. Once stripped of some of their electrons, the water ions can then be accelerated by the electrical properties of the solar wind.

Not all of the ions are accelerated outwards, some will happen to strike the comet’s surface. Solar wind particles will also find their way through the coma to hit home. When this happens, they cause a process called sputtering, in which they displace atoms from material on the surface – these are then ‘liberated’ into space.

There’s more at the link, including animations and simulations.

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SpaceShipTwo accident report released

12:16 pm

The National Transportation Safety Board today released the results of its investigation into last year’s SpaceShipTwo crash, concluding that the accident was caused by pilot error combined with the failure of the ship’s designers to include systems that could have prevented that error.

The National Transportation Safety Board concluded Tuesday that the developer of a commercial spacecraft that broke apart over the Mojave Desert last year failed to protect against the possibility of human error, specifically the co-pilot’s premature unlocking of a braking system that triggered the in-flight breakup of the vehicle.

In its recommendation, the board took pains to make clear that Scaled Composites, an aerospace company that has partnered with Virgin Galactic to develop the spacecraft, should have had systems in place to overcome the co-pilot’s mistake. NTSB Chairman Christopher Hart said he didn’t believe the company took shortcuts that compromised the spacecraft’s safety. Rather, he said, it didn’t consider that the crew would make such a mistake. “The assumption was these highly trained test pilots would not make mistakes in those areas, but truth be told, humans are humans,” Hart said after the hearing’s conclusion. “And even the best-trained human on their best day can make mistakes.”

This really isn’t news. This was the conclusion reached only weeks after the accident. It also does little to ease the problems at Virgin Galactic.

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