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Quantum Gravity Photon Race | by NASA Goddard Photo and Video
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Quantum Gravity Photon Race

In this illustration, one photon (purple) carries a million times the energy of another (yellow). Some theorists predict travel delays for higher-energy photons, which interact more strongly with the proposed frothy nature of space-time. Yet Fermi data on two photons from a gamma-ray burst fail to show this effect, eliminating some approaches to a new theory of gravity. The animation link below shows the delay scientists had expected to observe.

 

Credit: NASA/Sonoma State University/Aurore Simonnet

  

Full story:

www.nasa.gov/mission_pages/GLAST/news/first_year.html

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Taken on October 30, 2009