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Pasadena CA (JPL) May 20, 2011 NASA's two Gravity Recovery And Interior Laboratory (Grail) spacecraft have completed all assembly and testing prior to shipment to Florida. As seen in the photo, taken April 29, technicians installed lifting brackets prior to hoisting the 200-kilogram (440- pound) Grail-A spacecraft out of a vacuum chamber at Lockheed Martin Space Systems, Denver. Along with its twin Grail-B, the Grail-A spacecraft underwent an 11-day-long test that simulated many of the flight activities they will perform during the mission, all while being exposed to the vacuum and extreme hot and cold that simulate space. The Grail mission is scheduled for launch late this summer. The Grail-A and Grail-B spacecraft will fly in tandem orbits around Earth's moon for several months to measure its gravity field in unprecedented detail. The mission will also answer longstanding questions about the moon and provide scientists with a better understanding of how Earth and other rocky planets in the solar system formed.
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NASA probe shows Einstein theory was correctWashington (AFP) May 4, 2011 Huge objects in the universe distort space and time with the force of their gravity, scientists said Wednesday after a NASA probe confirmed two key parts of Albert Einstein's theory of general relativity. "Einstein survives," chuckled Francis Everitt, Stanford University physicist and principal investigator for Gravity Probe B (GP-B), one of the US space agency's longest running projects. ... read more |
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