Monday, December 26, 2011

Twin probes to circle moon to study gravity field
[ Mon, 26 Dec 2011 18:35:14 GMT ]

Using a precision formation-flying technique, the twin GRAIL spacecraft will map the moon's gravity field, as depicted in this artist's rendering. Over the New Year's weekend, a pair of spacecraft the size of washing machines are set to enter orbit around it in the latest lunar mission. Their job is to measure the uneven gravity field and determine what lies beneath — straight down to the core.


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