Dec 8, 2018

How did the NASA Fermi Gamma-ray Space Telescope measure all the starlight produced over 90% of the universe’s history?

Posted by in category: space

Starlight continues to travel across the cosmos long after its sources have burned out — which means that we can see stars that no longer exist. It also means that our astronomers can study stellar formation without looking at the stars at all, but by observing the gamma rays that shoot out from distant galaxies interacting with the starlight. Take a closer look:…q-2PIES2mQ

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