A History of the Universe Written in Gamma Rays

When astronomers look into the sky, they see bright objects, but also a diffuse glow coming from objects across the Universe in many different wavelengths. This glow could serve like a fossil record, to help astronomers untangle the different stages the Universe went through from the beginning, to the current day. Research teams are using very high energy gamma rays, generated in the most violent objects in the Universe – quasars – as a probe to understand this background light.

Site – http://www.universetoday.com

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