Asked by bob
MESSENGER will travel 4.9 billion miles to Mercury's orbit and will have to survive extreme conditions. For one thing, it will have to take a lot more of the sun's heat and energy than any other spacecraft. Additionally, MESSENGER will need to travel at extreme speeds—over 140,000 miles per hour!
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MESSENGER will journey roughly 4.9 billion miles to reach Mercury’s orbit and withstand very harsh conditions. It will be exposed to far more intense solar heat and radiation than any prior spacecraft, and it must travel at enormous speeds—well above 140,000 miles per hour.
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