Monday, June 21, 2010

More From Mars

Posted By on Mon, Jun 21, 2010 at 12:29 PM

  • NASA/JPL/University of Arizona

The UA Lunar and Planetary Lab has posted new photos from the HiRISE camera in orbit around Mars. See them here.

HiRISE team member Nathan Bridges tells us about the above photo:

This observation shows dark dunes and light polygonal terrain in Olympia Undae, also known as the North Polar Erg.

Two sets of dunes are obvious. The major set trends North-South, indicating winds from the East or West. Between the crests of these dunes is a second set oriented mostly East-West.

Zooming in on the dunes, a rippled texture is apparent, probably due to

redistribution of sand at the scale of meters and less. Near the crests of some dunes are channel-like features, with some branching downslope. The origin of these channels is unknown, but they may result from the flow and displacement of sand that was fluidized by sublimating carbon dioxide or water frost.

Bright patches of ground are found in some inter-dune areas, with many having a polygonal texture. Polygons on Earth form from contraction induced by stresses from dehydration, cooling, and other processes, so these features may have a similar origin. The CRISM instrument on MRO and OMEGA on Mars Express indicates that many dunes in Olympia Undae are rich in the mineral gypsum.


Subscribe to this thread:

Add a comment

More by Jim Nintzel

Staff Pick

Carnival of Illusion: Magic, Mystery & Oooh La La!

Carnival of Illusion conjures an evening of old-world magic by blending their international travel theme with all… More

@ Scottish Rite Grand Parlour Saturdays, 5:30 p.m., Sat., Oct. 3, 8 p.m. and Saturdays, 5 & 8 p.m. Continues through April 22 160 South Scott Ave

» More Picks

Submit an Event Listing

Popular Content

  1. Four Tucson Instagram Accounts You Need To Follow Now (The Range: The Tucson Weekly's Daily Dispatch)
  2. Which TUSD Board Candidates Favor Closing More Schools? (The Range: The Tucson Weekly's Daily Dispatch)
  3. Will Hispanics Help Elect Hillary in Arizona? 'Nah,' Said Jan Brewer, 'They don’t get out and vote.’ (The Range: The Tucson Weekly's Daily Dispatch)
  4. For Buckmaster Show Listeners (and Others), My TUSD Board Picks, Once Again (The Range: The Tucson Weekly's Daily Dispatch)
  5. Quick Bites: Eat No Evil (The Range: The Tucson Weekly's Daily Dispatch)

© 2016 Tucson Weekly | 7225 Mona Lisa Rd. Ste. 125, Tucson AZ 85741 | (520) 797-4384 | Powered by Foundation