Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Flying on the Mars Global Surveyor spacecraft, MOLA has bounced a laser beam off the Martian surface over 200,000,000 times producing a wealth of detailed elevation measurements. In fact, liquid water is not present on Mars' surface today, but may have been in the past . NASA's Mars Polar Lander spacecraft is scheduled to embark on an investigation of the role of water in the climate history of the Red Planet.
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