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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: http://svs.gsfc.nasa.gov/goto?10510 To find out more visit: http://www.nasa.gov/mission_pages/GLAST/news/first_year.html Want more? Subscribe to NASA on iTunes! http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=283424434 Or get tweeted by NASA: http://twitter.com/NASAGoddard 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 : http://www.newscientist.com/article/mg20327210.900-late-light-reveals-what-space-is-made-of.html A limit on the variation of the speed of light arising from quantum gravity effects: http://www.nature.com/nature/journal/vaop/ncurrent/full/nature08574.html
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