Video Link: https://www.youtube.com/watch?v=8bS5nUPhGO4

Nasa #39;s Fermi makes most accurate measurement of starlight in the Universe
This animation tracks several gamma rays through space and time, from their emission in the jet of a distant blazar to their arrival in Fermi #39;s Large Area Telescope (LAT). During their journey, the number of randomly moving ultraviolet and optical photons (blue) increases as more and more stars are born in the Universe. Eventually, one of the gamma rays encounters a photon of starlight and the gamma ray transforms into an electron and a positron. The remaining gamma-ray photons arrive at Fermi, interact with tungsten plates in the LAT, and produce the electrons and positrons whose paths through the detector allows astronomers to backtrack the gamma rays to their source. Video credit: Nasa #39;s Goddard Space Flight Centre/Cruz deWilde To find out more, read the article "Fermi measures cosmic #39;fog #39; produced by ancient starlight" at bit.lyFrom:popmechsaViews:14 0ratingsTime:01:21More inScience Technology

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Nasa's Fermi makes most accurate measurement of starlight in the Universe - Video