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NASA #39;S Fermi Measures Cosmic Fog Produced by Ancient Starlight. Explores the Early Universe GOODNEWS
goodnews.ws 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. Credit: NASA #39;s Goddard Space Flight Center/Cruz deWilde. - Astronomers using data from NASA #39;s Fermi Gamma-ray Space Telescope have made the most accurate measurement of starlight in the universe and used it to establish the total amount of light from all of the stars that have ever shone, accomplishing a primary mission goal. "The optical and ultraviolet light from stars continues to travel throughout the universe even after the stars cease to shine, and this creates a fossil radiation field we can explore using gamma rays from distant sources," said lead scientist Marco Ajello, a postdoctoral researcher at the Kavli Institute for Particle Astrophysics and Cosmology at Stanford University in California and the Space Sciences Laboratory at the University of California at Berkeley. Gamma rays are ...From:newssciencenewsViews:3 0ratingsTime:01:36More inScience Technology

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NASA'S Fermi Measures Cosmic Fog Produced by Ancient Starlight. Explores the Early Universe GOODNEWS - Video