1 Photon Carrying a Million Times More Energy Than Another (IMAGE)

NASA/Goddard Space Flight Center

1 Photon Carrying a Million Times More Energy Than Another

Caption

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

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