This is a visualization of a series of graphs showing the seasonal changes in the Martian polar caps. This particular version includes just the north pole without the Martian year timestamp. Note: Seasonal Mars snow variations graph (without dates) showing north pole. Data Collected: 1997/09/15-2001/06/30. Animator: Greg Shirah (NASA/GSFC). Scientist: David Smith (NASA/GSFC), Maria Zuber (Massachusetts Institute of Technology). Platforms/Sensors/Data Sets: MGS/MOLA, Viking.