North is up (the 12 o'clock position) in this seam-corrected 360 degree polar projection using images from sols, or Martian days, 1 and 3. Seam boundaries show different times of day. Mars, a cold desert planet with no liquid water on its surface, has water ice that lurks just below ground level in its arctic region. Discoveries made by the Mars Odyssey Orbited in 2002 show large amounts of subsurface water ice in the northern arctic plain. (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.