Wow! An 8' leap for a better shot! here.
My intuition tells me that our sampler arrival on Mars will reveal 'subject composition' to further-explain the infamous Grand Canyon (crater!)
Mars Canyon & Global Surveyor
Video: Lovely canyons, great music, and glass "Skywalk" (for Mortals)
And even a couple of Indians at end of clip... :)
And look! Valles Marinerisis: Martian Valley -Video (New window)
A huge Mars canyon system about 2,000 miles long and 5 miles deep!
Wow, it (somehow) appears to hold an Indian signature. THEMIS imaging!
NASA image: Valles Mariner/Marineris
(Captured from October 17, 1997.)
Mars Global Surveyor's wide angle cameras viewing the canyon from a distance of 360-600 miles...
Info Credit: MGS Project, JPL, NASA
Mission controllers had raised the spacecraft's aerobraking orbit...
to study the unexpected motion of one of the Surveyor's solar panels.
They're martians after all...
Water Still Flows in Brief Spurts on Mars NASA Images Suggest
Key Scientific Objectives of Mars Mission: jpl.nasa.gov
UPDATE: This animated image shows Mars in motion (1999 to 2005.) Images from the Mars Orbiter Camera aboard the Mars Global Surveyor spacecraft had documented dramatic changes in Mars south polar cap!
Image credit: NASA/JPL/MSSS
Teams will be examining polar changes after 2005...