Introductory Astronomy: 



Seasons on Mars

HST pictures

HST picture

Spacecraft Exploration:

Spirit rover peers into Bonneville Crater

A magnetic field pattern "frozen" in to the early crust of Mars. The Martian dynamo was, likely, dead a few hundred million years after formation, so these are traces of very early crustal movement and solidification.

Mars topography (blue is lowland, red-white is highland). Full Size JPG

Valles Marineris, plus Tharsis ridge volcanos on the far left

Olympus Mons

The dunes of Proctor Crater

Possible rock glacier

Possible very recent water flow and erosion/deposition

Old riverbeds

Craters filled with sediment.