04-03-2004
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TechSpot Chancellor
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Location: NC
Member since: Jan 2003, 1,573 posts
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Satellite to test Einstein predictions
Quote:
LOS ANGELES - A satellite designed to test two fundamental predictions made by Albert Einstein about the universe is ready for launch, 45 years after it was first proposed, NASA (news - web sites) and Stanford University officials said Friday.
The unmanned, Earth-orbiting satellite is designed to test two of Einstein's predictions about the nature of space and time, and how the Earth and other bodies warp and twist the fabric that combines the two.
At the spacecraft's heart are four pingpong-sized balls of quartz, the most perfect spheres ever made. To ensure accuracy, the balls must be kept chilled to near absolute zero, in the vacuum of the largest thermos ever flown in space, and isolated from any disturbances in the quietest environment ever produced, said Anne Kinney, director of the National Aeronautics and Space Administration's division of astronomy and physics.
Once in space and set spinning, the orientation of the balls should change — unless Einstein was wrong.
He proposed in 1916 that space and time form a structure that can be curved by the presence of a body, like the Earth, warping it like the dimple created by the heft of bowling ball resting on a soft mattress. That distortion accounts for gravity.
If theory holds, the mass and rotation of the Earth, 397 miles below the probe, should throw the alignment of the spinning balls off kilter in subtle but measurable ways.
The warping effect has been measured before. The twisting effect, called frame-dragging, has never been directly detected. Gravity Probe B aims to detect both
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http://story.news.yahoo.com/news?tmp...tein_satellite
Hmm... the beginning of our discovery of space travel? :-P
Either way that is a cool experiment.
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