Gravity Probe B

Gravity Probe B (GP-B) is a satellite-based mission which launched on 20 April 2004. The spaceflight phase lasted until 2005, and data analysis is expected to continue through 2010. Its aim is to measure spacetime curvature near Earth, and thereby the stress-energy tensor (which is related to the distribution and the motion of matter in space) in and near Earth. This will...
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