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NASA | Einstein's Cosmic Speed Limit

This version of the film is missing a shot. If you want to see the full version in all its glory, go to its listing in our film archive: To find out more visit: Want more? Subscribe to NASA on iTunes! Or get tweeted by NASA: In its first year of operations, NASA's Fermi Gamma-ray Space Telescope has mapped the entire sky with unprecedented resolution and sensitivity in gamma-rays, the highest-energy form of light. On May 10, 2009 a pair of gamma-ray photons reached Fermi only 900 milliseconds apart after traveling for 7 billion years. Fermis 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. To read more about the science behind the story: Late light reveals what space is made of : A limit on the variation of the speed of light arising from quantum gravity effects:
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