Messenger Liftoff

NASA's Messenger spacecraft lifted-off yesterday on its mission to Mercury. It will do a flyby of Earth one year from now, then two flybys of Venus and finally three flybys of Mercury for gravity assists before settling into orbit in 2011 -- a 7.9 billion kilometer journey. Once there, the science will begin in earnest, as eventually, NASA will be unable to keep Messenger in orbit and it will crash into the planet.

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