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

More by Jim Nintzel

  • Editor's Note

    Heroic Efforts
    • Dec 14, 2017
  • The Skinny

    In Jim Nintzel's last Skinny of 2017, he looks at the just-passed tax bill and the race for McSally's congressional seat.
    • Dec 7, 2017
  • Editor's Note

    We Will Rock You
    • Dec 7, 2017
  • More »
Today | Tue | Wed | Thu | Fri | Sat | Sun
Burlesque Fitness

Burlesque Fitness @ Floor Polish

Mondays, Wednesdays, 4:30-5:30 p.m.

All of today's events | Staff Picks

Staff Pick

Festival Band's New Year's Eve Dance

Join us at the Tucson University Park Hotel (formally Marriott) for our NYE Dance! We play Tejano,… More

@ Tucson University Park Hotel Dec. 1-Jan. 1 880 E. 2nd Street

» More Picks

Submit an Event Listing

Popular Content

  1. $59 Million Can Focus the Mind, Even If You're Facebook (The Range: The Tucson Weekly's Daily Dispatch)
  2. Laughing Stock: Holly Jolly Edition (The Range: The Tucson Weekly's Daily Dispatch)
  3. The Weekly List: 22 Things To Do in Tucson This Week (The Range: The Tucson Weekly's Daily Dispatch)
  4. The Weekly List: 26 Things To Do in Tucson This Week (The Range: The Tucson Weekly's Daily Dispatch)
  5. Ed Sec Betsy DeVos on School Choice, College Costs (The Range: The Tucson Weekly's Daily Dispatch)

© 2017 Tucson Weekly | 7225 Mona Lisa Rd. Ste. 125, Tucson AZ 85741 | (520) 797-4384 | Powered by Foundation