Friday, 7 August 2015

Station Avoids Satellite Fragment, Spacewalk Preps Start

The International Space Station moved out of the way of a piece of satellite debris late Saturday night.

The post Station Avoids Satellite Fragment, Spacewalk Preps Start has been published on Technology Org.

 
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VIDEO: Controversial DNA test comes to UK

A personal DNA test that has sparked controversy in the US launches in the UK. 
#science 
 » see original post http://www.bbc.co.uk/news/health-30304989#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

Curiosity catches a whiff of methane on Mars — and a possibility of past life

NASA has revealed that a whiff of methane has been detected twice in the last couple of years at the Martian surface by the Curiosity Rover.

The source of the methane is uncertain. It is not even clear if the methane originated on Mars or arrived there by way of a meteorite that landed on the surface of the red planet, but this is the strongest evidence yet of possible life in its ancient past.

"We have full confidence that there is methane in the atmosphere of Mars," announced John Grotzinger of CalTech, a Curiosity project scientist, on December 16. "Life is one of the few hypotheses for the formation of methane on Mars".

The data that the Curiosity Rover is collecting about what Mars is like today provides strong clues about its history. The first in situ detection shows methane in the Martian atmosphere at a low background level as well as in episodic spikes at 10 times the background concentration.

These latest results were announced at the American Geophysical Union's meeting in San Francisco, a gathering of more than 25,000 Earth and planetary scientists. The findings, published in the journal Science, were obtained through separate periods of daytime sampling in late 2013 and early 2014.

The results were described as "An unexpected episodic increase in the Mars methane" by members of the project. Sushil Atreva, of the University of Michigan said: "A sudden spike and just as suddenly a disappearance of methane tells us that the Mars surface is communicating with the atmosphere."

How did it get there?

There are three likely scenarios for the origin of the methane. The first is alteration of surface organics formed from past life on Mars that have since been broken down by the Sun's ultraviolet rays.

Another is a reaction of water with minerals in the Martian subsurface that created methane from olivine in a process called serpentinisation. Or it could have been delivered from elsewhere in the Solar System as cosmic dust or micrometeorites.

Once produced, it seems most likely that the methane was stored as gas ice-like crystals, called clathrate hydrates, in the subsurface.

Possible pathways for methane on Mars. | (Courtesy NASA/The Conversation UK)

It seems that the methane is periodically destabilized and escapes into the atmosphere. It is distributed across the surface of the planet by winds over the course of a few months, and then oxidized by photochemistry, eventually breaking down to CO2 in the atmosphere. The methane source was described by NASA scientists as localized and small, and they claim that this strongly suggests Mars is currently active.

Now what?

Grotzinger said that NASA doesn't know when methane will next appear but will monitor the surface continuously in a bid to determine how it got there.

The NASA scientists suggest that the methane originates from organic compounds accumulated in the Martian sediment, possibly early in the planet's history, maybe billions of years ago. Loose sediment accumulates organics, they explained, which are degraded by cosmic radiation. Fluids containing oxidising compounds then move through the rock, and the rock undergoes chemical change. Then cosmic radiation destroys the organics.

Instruments on board Curiosity identified a compound called chlorobenzine from samples of dust drilled at the Gale crater. For Roger Summons of the Massachusetts Institute of Technology, this chlorobenzine is indicative of "more complex organic matter in the sample".

"The stability of the clathrates depends on where are they are in the surface. Small impacts or thermal stresses may have destabilized the clathrates, which may represent ancient methane. They can be stored for billions of years," said Syshil Atreya, from the University of Michigan.

The background levels measured in the Martian gas samples correspond to a total of around 5,000 tons of methane in the entire atmosphere. At their peak, the methane "burps" reached concentrations 10 times this amount. This compares with the much higher amount of methane in Earth's air, which stands at around 500,000,000 tons.

The team is planning further drilling samples to try to characterize the nature of the source of the methane in the trapped sediments.

More from The Conversation UK...

 
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 » see original post http://theweek.com/articles/441447/curiosity-catches-whiff-methane-mars--possibility-past-life

Unseen Amsterdam - a glimpse behind the scenes as two waitresses have a quiet break.

Unseen Amsterdam - a glimpse behind the scenes as two waitresses have a quiet break.
+Discover Amsterdam

 » see original post https://plus.google.com/+MarkHightonRidley/posts/AJPoNpLqLJa

What if a Black Hole Met an Antimatter Black Hole?

Would shooting a black hole into an antimatter black hole destroy them both? I’ve wondered out loud how

The post What if a Black Hole Met an Antimatter Black Hole? has been published on Technology Org.

 
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Paintings of Birds Sprinkled with Color by Frank Gonzales

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Artist Frank Gonzales refers to his process as a cross-pollination of elements, a mixture of realism and artificiality expressed through acrylic paintings of birds perched atop plants and crystaline formations. “I like to construct and deconstruct during the process, leaving traces of my journey in the end results,” Gonzales says. His careful depictions of wildlife are somewhat reminiscent of Audubon’s style, but the colorful drips of paint and other surreal elements gives each painting a fresh, illustrative feel.

Gonzales most recently toured around New Mexico with Santa Fe Exports and he has a number of prints and original paintings available through several galleries. You can also follow his work on Instagram.

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#funandrandom 
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Space Image: Pluto’s moon Charon

Icy world Charon is 1,200 kilometers across. That makes Pluto’s largest moon only about 1/10th the size of

The post Space Image: Pluto’s moon Charon has been published on Technology Org.

 
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Brown Dwarfs, Stars Share Formation Process, New Study Indicates

Astronomers using the Karl G. Jansky Very Large Array (VLA) have discovered jets of material ejected by still-forming

The post Brown Dwarfs, Stars Share Formation Process, New Study Indicates has been published on Technology Org.

 
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