Date: Fri, 19 Dec 2003 09:47:58 -0800 (PST)
   From: Ron Baalke <baalke@zagami.jpl.nasa.gov>
Subject: Mars Odyssey THEMIS Images - December 10-19, 2003


MARS ODYSSEY THEMIS IMAGES
December 10-19, 2003


o Mars South Polar Layered Deposits (Released 10 December 2003)
  http://themis.la.asu.edu/zoom-20031210A.html

o Solar storms, devils, dunes, and gullies (Released 12 December 2003)
  http://themis.la.asu.edu/zoom-20031212a.html

o Sea of Sand in Juventae Chasma (Released 17 December 2003)
  http://themis.la.asu.edu/zoom-20031217a.html

o Asymmetric Crater (Released 18 December 2003)
  http://themis.la.asu.edu/zoom-20031218a.html

  Asymmetric craters such as the one in the center of 
  this image are fairly rare. The more typical symmetric craters 
  are formed when meteors impact a surface over a wide range of
  angles. Only very low impact angles (within 15° of horizontal) 
  result in asymmetric structures such as this one. The bilateral 
  symmetry of the ejecta, like two wings on either side of the 
  elliptical crater, is typical of oblique impacts. The small 
  crater downrange from the main crater could have been caused by 
  the impactor breaking apart before impact or possibly a 
  'decapitation' of the impactor as it hit with the 'head' 
  traveling farther to form the smaller structure.