VIDEO NASA's 'Tumbleweed' rover could someday be rolling across the surface of Mars. CNN's Allard Beutel reports (September 6) Play video (QuickTime, Real or Windows Media)

(CNN) -- NASA is always trying to develop new and innovative ways to explore space. Now researchers have come up with a totally different kind of rover that could someday be rolling across the surface of Mars.

CNN's Allard Beutel looks at the "tumbleweed rover."