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In this illustration, one photon (purple) carries a million times the energy of another (yellow). Fermi data on two photons from a gamma-ray burst fail to show any travel delay, showing the speed of light’s constancy across energy. Image credit: NASA/Sonoma State University/Aurore Simonnet.
https://scienceblogs.com/startswithabang/2017/06/25/comments-of-the-week-166-from-expanding-faster-than-light-to-periodic-mass-extinctions
Tags: fótons, Luz
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