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SlideshowReport

The Topography of Mars

Description
The color coding on this map of Mars shows elevations
above (positive numbers) or below (negative numbers)
the planet’s average radius. To produce this map, an
instrument on board Mars Global Surveyor fired pulses of laser
light at the planet’s surface, then measured how long it took
each reflected pulse to return to the spacecraft. The Viking 1
Lander (VL1), Viking 2 Lander (VL2), Mars Pathfinder (MP),
Opportunity, and Spirit landing sites are each marked with an
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