Einstein's Cosmic Speed Limit ｜ heaven space
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.
http://www.nasa.gov/images/content/398056main_einsteins_comic_226.jpg
http://www.youtube.com/watch?v=1mkKhn53L68
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