CAPE CANAVERAL, Florida - Four decades after landing men on the moon, NASA is returning to Earth's orbiting companion, this time with a set of robotic twins that will measure lunar gravity while chasing one another in circles.
By creating the most precise lunar gravity map ever, scientists hope to figure out what's beneath the lunar surface, all the way to the core. The orbiting probes also will help pinpoint the best landing sites for future explorers, whether human or mechanical.
Near-identical twins Grail-A and Grail-B – short for Gravity Recovery and Interior Laboratory – are due to blast off on Thursday in the US aboard an unmanned rocket
Read more: http://www.smh.com.au/technology/sci-tech/nasa-launching-twin-moon-probes-to-measure-gravity-20110906-1jus3.html#ixzz1XV7H40Ma
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