Tag: engineering

New study finds fracking does not contaminate drinking water

8:19 am

The uncertainty of science: A new study, using data from more than 11,000 drinking water wells in northern Pennsylvania, has found no evidence that fracking causes contamination.

The new study of 11,309 drinking water wells in northeastern Pennsylvania concludes that background levels of methane in the water are unrelated to the location of hundreds of oil and gas wells that tap hydraulically fractured, or fracked, rock formations. The finding suggests that fracking operations are not significantly contributing to the leakage of methane from deep rock formations, where oil and gas are extracted, up to the shallower aquifers where well water is drawn.

The result also calls into question prominent studies in 2011 and 2013 that did find a correlation in a nearby part of Pennsylvania. There, wells closer to fracking sites had higher levels of methane. Those studies, however, were based on just 60 and 141 domestic well samples, respectively.

The article outlines in detail the many disagreements and uncertainties of both the old studies and this new one. It also however contains this one key quote about the earlier studies, buried in the text, that illustrates the politics influencing the reporting of the anti-fracking research:

The two papers seemed to show that fracking was leading to increased concentrations of methane in drinking water. Dissolved methane is not toxic, and drinking water often contains significant background levels of the gas from natural sources. [emphasis mine]

The earlier studies were blasted everywhere by the media. They were used to show the harm fracking does, and were the justification for the banning of fracking in New York. Yet, the methane they found was not necessarily caused by fracking, and isn’t even a health concern anyway.

I wonder if the press will give this new report as much coverage. It might not be right, but it sure does indicate that the science is unsettled, and that the risks from fracking are, as usual in these days of doom-saying environmentalism, overblown.

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U.S./Russian deal on space cooperation past 2024?

9:23 am

Russian news sources today described a news conference in Russia where it was announced that NASA and Roscosmos have come to an agreement about extending ISS until 2024, establishing common standards for manned vehicles, and to work together on building a new space station to replace ISS after 2024.

It appears that NASA head Charles Bolden is in Russia right now as part of the start of the year-long mission on ISS, and he has negotiated some agreement with Russia. If these reports are accurate, then it means that Russia has decided to work with the U.S. rather than go it alone on their next station.

All this assumes that future presidents and Congress agree with this proposal, a very big assumption indeed.

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A photo tour of Vandenberg Air Force Base

3:15 pm

Yesterday, as part of my visit to Vandenberg Air Force Base to give a space history lecture to the local section of the American Institute of Aeronautics and Astronautics, I was given a short tour of these west coast launch facilities. While Kennedy is used for launches that circle the equator, Vandenberg, with its southern-facing coast, launches rockets that head south over the ocean for a polar orbit.

We only had time to go inside one launchpad, where unfortunately I was not permitted to take pictures. However, the images I did get will give you a reasonable sense of the layout for this spaceport, which is increasingly becoming a spaceport for private launch companies like ULA and SpaceX. Though the bulk of business for both companies here might be military and government payloads, the future is still going to include a lot of private payloads. The images also help to highlight the differences between these two companies, as well as some past history, as one of these launchpads was once intended for the space shuttle, though never used for that purpose.
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Air Force subsidies to ULA to end

9:32 am

The competition heats up: Because it has concluded that they make it impossible to have a fair competition for contracts, the Air Force has decided to phase out the subsidies it has been paying to the United Launch Alliance (ULA).

The specific amounts of these subsidies have been effectively buried by the Air Force in many different contracts, so we the taxpayers really don’t know how much the are.

Nonetheless, this decision, combined with the military report released yesterday that criticized the Air Force’s over-bearing and restrictive certification process with SpaceX indicates that the political pressure is now pushing them hard to open up bidding to multiple companies, which in turn will help lower cost and save the taxpayer money.

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How scientists are using the Kelly twins during Scott Kelly’s year-long mission to ISS to learn how weightlessness effects the human body

9:21 am

Link here. Scott Kelly launches today to the station to begin the flight.

The article’s headline and initial focus on how the Kellys’ privacy rights might interfere with the research seems inappropriate. It is as if the author and Nature wanted to spin the story to force the Kellys to reveal private medical data they would prefer to keep private.

The real story the article tells is that an incredible wealth of knowledge about microgravity will be gained by this flight, because the Kellys are both participating. And depending on what is learned when their entire genomes are sequenced, we might also be able to study that fully as well.

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NASA has decided to grab an asteroid rock rather than bag an asteroid

10:43 pm

Rather than try to bag an entire small asteroid with an unmanned probe and bring that back to Earth, NASA has decided to send an unmanned probe into orbit around an asteroid and use it to grab one of the asteroid’s boulders.

The $1.25 billion mission, which is planned to launch in December 2020, would send a robotic spacecraft for a rendezvous with an asteroid in 2022. After touching down on the asteroid’s surface, the spacecraft would snatch a boulder several meters across. The spacecraft would then orbit the asteroid for up to 400 days, testing out an idea for defending Earth from a catastrophic asteroid impact: using the spacecraft’s own gravitational field to subtly alter the asteroid’s orbit. Next, the spacecraft would bring the snatched rock back to Earth’s vicinity in 2025. Finally, as part of preparations for a possible mission to Mars, astronauts would visit and examine the rock for some 25 days, using the planned Orion spacecraft to make the trip.

From both a science perspective as well as a manned space perspective, the unmanned part of this plan is a very good idea. Whether it will get funded depends upon Congress, since its roots go back to President Obama’s April 2010 commitment to send astronauts to an asteroid by 2025. Such a commitment was never really realistic, so it has devolved to capturing a rock and sending astronauts to visit it, thus meeting Obama’s commitment in a Potemkin Village sort of way.

Much better to bring the rock back to Earth orbit where it can be captured and brought to ISS by any number of vehicles and studied there. Whether Congress will fund this in the manner proposed in order to help Obama meet his commitment however remains very doubtful.

Posted from Santa Barbara, California.

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Curiosity finds nitrates on Martian surface

12:01 pm

Using data from Curiosity scientists have for the first time identified nitrates, also called fixed nitrogen, on the Martian surface.

There is no evidence to suggest that the fixed nitrogen molecules found by the team were created by life. The surface of Mars is inhospitable for known forms of life. Instead, the team thinks the nitrates are ancient, and likely came from non-biological processes like meteorite impacts and lightning in Mars’ distant past.


Features resembling dry riverbeds and the discovery of minerals that form only in the presence of liquid water suggest that Mars was more hospitable in the remote past. The Curiosity team has found evidence that other ingredients needed for life, such as liquid water and organic matter, were present on Mars at the Curiosity site in Gale Crater billions of years ago.

The data also suggests that these nitrates are widespread on the Martian surface.

The most important aspect of this discovery to me is not so much that it suggests the faint possibility of past life on Mars but that it makes Mars a more hospitable place for life in the future. Nitrates are essentially fertilizer, and for Mars to have this material in the soil already means it will be easier to figure out how to grow crops there.

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Sierra Nevada makes deal with Houston airport authority for Dream Chaser landings

10:19 am

Sierra Nevada has made an agreement with Houston’s airport authority to use Ellington Airport there to land its Dream Chaser spacecraft.

This announcement is part of the public relations push going on right now as NASA prepares to award its next round of cargo freighter contracts to two private companies. Sierra Nevada has bid to use an unmanned version of Dream Chaser to launch that cargo.

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Opportunity’s flash memory reformatted successfully

10:15 am

A three month old flash memory problem on the Mars rover Opportunity has finally been fixed by reformatting the rover’s memory banks.

Since the problem came up in December they have been operating the rover without any flash memory, essentially running it on the equivalent of its ram memory. This fix allows them to once again store data on the rover and gives them more flexibility of operation.

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A photo tour of Vostochny

9:56 am

The Siberian Times has posted a very interesting photo tour of Russia’s new spaceport, Vostochny, presently under construction.

The article is very much a propaganda piece pushed by the Russian government (some photos were actually taken by Russian First Deputy Prime Minister Dmitry Rogozin himself), but it still gives you a sense of the scale and size of the project.

It is quite instructive to compare how the Russians do things, with a giant public works project costing $5 billion and taking more than a decade to build, with how the Americans do things, with a small privately-built space port being constructed by SpaceX in Brownsville for mere millions and in only a few years.

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India extends Mangalyaan’s mission by six months

9:20 am

Western slopes of Arsia Mons

Having successfully completed its nominal six month mission and continuing to operate perfectly, ISRO has extended the mission of India’s Mangalyaan Mars orbiter for another six months.

Take a gander at the images the orbiter has been sending down. Quite impressive. The cropped image on the right shows the western slopes of the giant volcano Arsia Mons, with white water vapor hovering above those slopes. (Click on the image for the full resolution version.) The water vapor is significant because scientists believe that this region once had many glaciers, and that much of that water is still present and trapped below the surface as ice, possibly in many of the caves that are there. The vapor’s presence, a routine occurance here, strengthens this theory.

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Test flight of rail-guided launcher delayed to October

9:14 am

The competition heats up: The first test flight of a rail-guided military small satellite launcher has been delayed until October 2015.

“Launch delays of the new launch system were driven primarily by technical development challenges on the first stage motor including design and delivery of the rocket motor case and the integrated rocket motor,” Anttonen said in a response to written questions from Spaceflight Now. “This motor is now complete along with the rest of the launch vehicle, and the launch is on hold pending an opening in the range schedule,” Anttonen said.

The launch system is designed to provide launch capability for small satellites like cubesats, with a launch cost of $12 to $15 million. If successful, it will be a direct competitor to Virgin Galactic’s LauncherOne, except that it appears it might be operational first.

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Russian tourism flights to resume in 2018

9:06 am

The competition heats up: Faced with the loss of income from NASA in 2017, when private commercial ferries take over the job of bringing Americans to ISS, Russian officials today revealed that they plan to resume launching tourists to the station in 2018.

The problem the Russians will have then is that they will have competition from the American companies, who will likely be able to compete in price with them, and will be easier to work with.

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Further SLS delays loom

9:32 pm

A report by NASA’s inspector general finds that the planned first launch of the SLS rocket in November 2018 is threatened with delay because the ground facilities at Kennedy might not be ready.

In a report released Wednesday, NASA’s Office of Inspector General warned that Ground Systems Development and Operations, or GSDO, may be hard-pressed to have Kennedy Space Center’s launch facilities ready on time. Ground systems are a critical piece of the SLS-Orion infrastructure. All three elements are tightly integrated, with ground systems requiring significant input from the rocket and capsule designs. “GSDO cannot finalize and complete its requirements without substantial input for the other two programs,” said Jim Morrison, the assistant inspector general for audits. “And NASA is still finalizing the requirements for those programs.”

Gee, I guess SLS isn’t getting enough money, as its budget is only about $3 billion per year (about six times what the commercial space program gets per year, a program that has already created two freighter systems for ISS and is now creating two manned ferry systems for ISS). Why don’t we give them more, so that even more won’t be done with the money we spend?

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Rosetta’s first attempt to contact Philae ends with no contact

8:59 am

After eight days of sending signals, listening for Philae, and getting no response, Rosetta has ceased its effort.

“It was a very early attempt; we will repeat this process until we receive a response from Philae,” says DLR Project Manager Stephan Ulamec. “We have to be patient.” On 20 March 2015 at 05:00 CET, the communication unit on the Rosetta orbiter was switched off. Now, the DLR team is calculating when the next favourable alignment between the orbiter and the lander will occur, and will then listen again for a signal from Philae. The next chance to receive a signal from the lander is expected to occur during the first half of April.

They always knew that it was unlikely for the lander to come alive this soon, but they tried anyway. The odds improve, however, in the coming months.

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How NASA will use Bigelow’s privately built ISS module

8:55 am

Not much it seems. The key paragraph is this:

Once installed, BEAM will be largely sealed off from the rest of ISS, with astronauts entering it every four to six months to retrieve data from sensors inside it. Crusan suggested NASA will consider making greater use of the module over time as the agency becomes more comfortable with its performance. That would require additional work inside the module, he said, since it has no active life support system beyond some fans.

This story illustrates NASA’s sometimes incredibly over-cautious approach to new technology. I grant that space is difficult and that it is always wise to be careful and to test thoroughly any new technology, but NASA sometimes carries this too far. For example, it took NASA more than two decades of testing before it finally approved the use of ion engines on a planetary mission (Dawn). Similarly, inflatable modules were abandoned by NASA initially, and wouldn’t even exist if a private company, Bigelow, hadn’t grabbed the technology and flown it successfully.

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Giant lava tubes possible on the Moon

1:58 pm

New analysis of the lunar geology combined with gravity data from GRAIL now suggests that the Moon could harbor lava tubes several miles wide.

David Blair, a graduate student in Purdue’s Department of Earth, Atmospheric and Planetary Sciences, led the study that examined whether empty lava tubes more than 1 kilometer wide could remain structurally stable on the moon. “We found that if lunar lava tubes existed with a strong arched shape like those on Earth, they would be stable at sizes up to 5,000 meters, or several miles wide, on the moon,” Blair said. “This wouldn’t be possible on Earth, but gravity is much lower on the moon and lunar rock doesn’t have to withstand the same weathering and erosion. In theory, huge lava tubes – big enough to easily house a city – could be structurally sound on the moon.”

You can read their paper here. If this is so, then the possibility of huge colonies on the Moon increases significantly, as it will be much easier to build these colonies inside these giant lava tubes.

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Mars One finalist kicked out for publicly criticizing company.

9:31 am

The Mars One finalist who publicly criticized the company’s proposed one-way Mars mission has been kicked out.

The company claims he breached their confidentiality rules. In addition, other finalists have contested his criticisms. Their points seem reasonable, but the bottom line remains that the project is unrealistic and will not fly. They lack the funding and the technology to do it, and won’t have it for decades.

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Sierra Nevada introduces its cargo version of Dream Chaser

6:35 pm

The competition heats up: Sierra Nevada has unveiled a revised cargo version of Dream Chaser, competing for NASA next round of freighter contracts to ISS.

They have made a number of changes, but the most significant is the new folding wings, allowing the spacecraft to fit inside the fairings of most rocket systems. This also eliminates one of the concerns I have read about the previous design on whether its wings could have withstood exposure to the maximum atmospheric stresses experienced during launch.

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Lockheed Martin enters the competition to supply cargo for ISS

5:42 pm

The competition heats up: Lockheed Martin has joined Sierra Nevada, Orbital ATK, Boeing, and SpaceX in bidding for NASA’s next contract to ferry cargo to ISS.

Lockheed’s proposal is different in that it proposes a two spacecraft operation. The cargo would be hauled up in a very simple storage bin, where a long-term orbital tug would grab it and take it to ISS. The idea is that they would only have to build and launch the complicated thrusters, robot arms, computers, and avionics of their cargo freighter once, thereby saving money.

Two companies will be chosen. Since the first competition back in the mid-2000s, when NASA picked SpaceX and Kistler for the first cargo round, the quality of the bids has improved remarkably. Back then, NASA had to choose from a bunch of new companies, none of which had ever done this before. The big companies (Boeing, Lockheed Martin) then poo-pooed the competition, saying that it couldn’t be done as cheap as the new companies claimed. After Kistler went under and was replaced by Orbital, they and SpaceX proved the big companies were wrong.

Now the competition includes all the big players, except that those big players are no longer offering expensive systems but cut-rate efficient designs that are as cost effective as SpaceX and Orbital’s first designs.

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Water ice volcanoes on Ceres

2:12 pm

Data collected by Dawn since it entered orbit around Ceres on March 6 now strongly suggests that the bright spots on the surface are produced by venting water,

Andreas Nathues, principal investigator for Dawn’s framing camera, says the feature has spectral characteristics that are consistent with ice. Intriguingly, the brightness can be seen even when the spacecraft is looking on edge at the crater rim, suggesting that the feature may be outgassing water vapor above the rim and into space. “Ceres seems to be indeed active,” he says. The feature brightens through the course of the day, and then shuts down at night. Nathues says the behavior is similar to that of comets.

More here. By mid-April Dawn should finally settle this with high resolution images.

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