This framegrab image from NASA-TV shows the twin GRAIL satellites atop a United Launch Alliance Delta II rocket as they launch Saturday Sept. 10, 2011 from the launch pad at the Cape Canaveral Air ... more 
This framegrab image from NASA-TV shows the twin GRAIL satellites atop a United Launch Alliance Delta II rocket as they launch Saturday Sept. 10, 2011 from the launch pad at the Cape Canaveral Air Force Station after being scrubbed in Cape Canaveral, Fla., Thursday. NASA is sending the probes on a long, roundabout trip to the moon. The spacecraft will orbit the moon, chasing one another in circles so researchers can measure the gap and the gravity below. It will be the first lunar mission devoted to studying the insides of the moon. By measuring the entire gravity field of the moon, scientists hope to learn what the moon is made of all the way to its core. (AP Photo/NASA-TV) less 
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Associated Press | Photo By NASA-TV
Sat, Sep 10, 2011 9:16 AM EDT