Science: Easier Moons

Plans for voyaging to the moon are a dime a dozen, but according to Astronomy Professor Jan Schilt of Columbia University, they are all aimed at the wrong moon. Last week he explained why man's first round trip to an extraterrestrial body may be to one of the moons of Mars.

The earth's moon is handy, only 238,857 miles away, but its considerable size (2,160 miles diameter) makes it a trap in space. Its gravitational pull is one-sixth as strong as the earth's, which means that unless a spaceship is braked in some way, it...

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