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Einstein's Cosmic Speed Limit  |  heaven space

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發表於 2011-8-3 12:09:07 | 顯示全部樓層 |閱讀模式
本帖最後由 Zubenelgenubi 於 2011-8-3 12:17 編輯

On May 10, 2009 a pair of gamma-ray photons reached the Fermi Gamma-Ray Space Telescope only 900 milliseconds apart after traveling for 7 billion years. Fermi’s measurement gives us rare experimental evidence that space-time is smooth as Einstein predicted, and has shut the door on several approaches to gravity where space-time is foamy enough to interfere strongly with light.



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