Learning On Earth From 'Off-World' Electric Vehicles
Electric cars may still play second fiddle to gas-guzzlers here on Earth, but they've dominated the Martian driving scene for more than a decade.
NASA's tiny Sojourner rover hit the red dirt in 1997, followed by the golf-cart-size twins Spirit and Opportunity in 2004. And last August, the 1-ton Curiosity rover dropped in to determine whether Mars could ever have supported microbial life.
All three generations of six-wheeled NASA rovers have used electric power systems of various design and complexity to find their way around the Red Planet.
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