In about 20 days, NASA's Curiosity rover will land on Mars. Doing so, involves going from 13,000Mph to 0 in 7 minutes, all done automatically by a per-programmed computer. The video below explains how they solved a number of problems to make it work. The solution is scientific problem solving at its best. Really, it's a riveting video.
My favorite quote:
This big huge parachute that we've got, it will only slow us down to about 200 miles per hour...and that's not slow enough to land...so...we have no choice...we've got to cut it off...and come down on rockets.
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