Einstein's Cosmic Speed Limit

  • Released Wednesday, October 28, 2009
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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. 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.

Watch this video on the NASAexplorer YouTube channel.

For complete transcript, click here.

For More Information

See http://www.nasa.gov/mission_pages/GLAST/news/first_year.html

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NASA/Goddard Space Flight Center

This page was originally published on Wednesday, October 28, 2009.
This page was last updated on Wednesday, May 3, 2023 at 1:54 PM EDT.

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