Wednesday, May 27, 2009

More From Mars

Posted By on Wed, May 27, 2009 at 6:41 PM

bf82/1243468270-esp_011711_0930.jpg

96f5/1243467818-esp_012252_1245.jpg

A new batch of Mars photos taken by the UA Lunar and Planetary Lab's HiRISE camera aboard the Mars Reconnaissance Orbiter is available online. The upper shot is titled simply "Spider Evolution," while the lower shot features sandy Martian dunes that have been swept by dust devils.

NAU student Addie Hite explains:

This image is located in a crater in the Hellespontus region that displays dunes and dust devil tracks.

The larger barchan-like dunes are surrounded by

linear ripples and dark coarse material. The dunes are composed of basaltic sands that have accumulated in the troughs of the dunes. The dunes themselves run in a northeast to southwest direction. The steep west facing slip face indicates that the dune is controlled by a southeasterly direction and that the winds here tend to blow from left to right.

Both the sandy and rough textured surfaces are crisscrossed by the tracks of dust devils. These tracks form when dust devils abrade the surface exposing the underlying darker surface. The tracks appear to be clustered since dust devils frequently form in areas that have been previously scoured. The lighter tracks are older tracks that are fading or have been overprinted by other dust devils.

It is possible that the dunes are stable as many of the dust devils appear to be going to the southeast direction (based on scallop patterns- dust devil leaves behind dark circular patterns and erase the frost as it moves forward by local winds). This is an indication of change of wind especially since the dune field is in a crater.

Photo by NASA/JPL/University of Arizona

Comments

Showing 1-1 of 1

Add a comment

 
Subscribe to this thread:
Showing 1-1 of 1

Add a comment

Previously in the Range

More by Jim Nintzel

Today | Sat | Sun | Mon | Tue | Wed | Thu
Saturday Tour & Tasting

Saturday Tour & Tasting @ Hamilton Distillery

Saturdays, 3-5 p.m.

All of today's events | Staff Picks

Staff Pick

@ Mission Garden Saturdays, 8 a.m.-12 p.m. Continues through Nov. 24 Corner of Grande Avenue and Mission Lane.

» More Picks

Submit an Event Listing

Popular Content

  1. 22 Great Things to Do in Tucson This Weekend: Sept. 21-Sept. 23 (The Range: The Tucson Weekly's Daily Dispatch)
  2. Get Your Dog Washed For A Good Cause - P.S. there is an opp-beer-tunity. (The Range: The Tucson Weekly's Daily Dispatch)
  3. Zona Politics: Talking Congressional and Legislative Races with Journalists Dylan Smith and Hank Stephenson (The Range: The Tucson Weekly's Daily Dispatch)
  4. Shardonee Hayes and Arizona Volleyball Sweep Arizona State in Pac-12 Opener (The Range: The Tucson Weekly's Daily Dispatch)
  5. Claytoon of the Day: The More Things Change (The Range: The Tucson Weekly's Daily Dispatch)

© 2018 Tucson Weekly | 7225 Mona Lisa Rd. Ste. 125, Tucson AZ 85741 | (520) 797-4384 | Powered by Foundation