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The extraterrestrial robot rolls 25 miles across the Red Planet, breaking a more than 40-year-old record for off-Earth mileage.
Researchers explain why reflectors left on the moon 40 years ago aren't cooperating when it comes to returning laser beams meant to measure the orb's distance from Earth.
Breaking the record of miles trekked by a NASA vehicle in another world, the Mars rover traverses 22.2 miles across the Red Planet.
Researchers headed north to simulate a lunar environment. Unfortunately, the weather has been a little too nice. Photos: Lunar rovers on a test drive