Four wheels are better than six for off-roading in craters.
But LCROSS only confirmed that ice was definitely present in a single crater at the moon’s south pole. VIPER, a mobile rover, will probe the distribution of water ice in greater detail. Drilling beneath the lunar surface is one task. Another is to move into steep, permanently shadowed regions—entering craters that, due to their sharp geometry, and the low angle of the sun at the lunar poles, have not seen sunlight in billions of years.
Developed by NASA Ames and Pittsburgh-based company Astrobotic, VIPER is a square golf-cart-sized vehicle about 5 feet long and wide, and about 8 feet high. Unlike all of NASA’s Mars rovers, VIPER has four wheels, not six. “The metaphor I like to use is we have the ability to dip a toe into the [permanently shadowed region],” Andrews says. ”If we find we’re surprised or don’t like what we’re finding, we have the ability to lift that toe out, roll away on three wheels, and then put it back down.”
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