Twin probes to circle moon to study gravity field

December 27, 2011 at 1:55 am in The Daily Republic

LOS ANGELES (AP) The moon has come a long way since Galileo first peered at it through a telescope. Unmanned probes have circled around it and landed on its surface. Twelve American astronauts have walked on it. And lunar rocks and soil have been hauled back from it.
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