NASA scientists explain the challenges of landing a spacecraft (
Curiosity, scheduled for a 10:31 p.m. PDT August 5 touchdown) on Mars, where the atmosphere is 100 times thinner than Earth's, and how they're meeting them. It all involves a supersonic parachute, extra rockets, and a tether, and it's super-cool (video):
http://www.jpl.nasa.gov/video/index.cfm?id=1090
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