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Tess Falor
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This is awesome!
A New Gully Channel in Terra Sirenum, Mars! This pair of before (left) and after (right) images from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter documents the formation of a substantial new channel on a Martian slope between Nov. 5, 2010, and May 25, 2013. Gully or ravine landforms are commonly found in the mid-latitudes on Mars, particularly in the southern highlands. These features typically have an alcove at the upper end, feeding into a channel and an apron of debris that has been carried from above. Researchers using HiRISE have discovered many examples of gully activity likely driven by seasonal carbon-dioxide frost (dry ice).

The changes visible by comparing the 2010 and 2013 observations at this site formed when material flowing down from the alcove broke out of an older route, eroded a new channel and formed a deposit on the apron. Although this pair of observations does not pin down the season of the event, locations HiRISE has imaged more often demonstrate that this sort of event generally occurs in winter, when liquid water is very unlikely. Despite their resemblance to water-formed ravines on Earth, carbon dioxide may play a key role in the formation of many Martian gullies.

Image credit: NASA/JPL-Caltech/Univ. of Arizona

#mars #hirise #mro #planets #gully #water #science
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Tess McEnulty was tagged in Tess McEnulty's album.
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Join in ~15 minutes to hear about asteroids!
This Friday at 2pm ET, the White House will host a "We The Geeks" Google+ Hangout on asteroids with experts including NASA Deputy Administrator Lori Garver, former astronaut Ed Lu, and Bill Nye the Science Guy: http://at.wh.gov/lvjzd

Tune in to find out how experts are working to find asteroids before they find us—and other potential opportunities these space rocks present. Ask your questions using #WeTheGeeks and we'll answer some during the hangout.
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Had a lot of fun at the Grand Canyon the last couple of days.  Been working on this project for a long time and I am really excited to see it get so much positive reaction.

http://video.msnbc.msn.com/nightly-news/49543431
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Division for Planetary Sciences annual meeting in Reno
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DPS2012
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Pictures of AHS 2012
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Ancestral Health Symposium 2012
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Who wants to get together this Sunday for a solar eclipse viewing party? It's going to be sweet! I'll figure out the best place in the East Bay to watch.

http://www.huffingtonpost.com/2012/05/16/annular-solar-eclipse-2012_n_1522000.html
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The lunch dishes at Google's Crave cafeteria are all paleo today. Yum! :)
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