Friday, November 30, 2018

Astrophysicists Count All the Starlight in the Universe

By their estimate, over the history of the universe, stars have emitted 4 times 10-to-the-84th-power photons into the visible universe (that's a 4 followed by 84 zeros).

from NDTV Gadgets - Latest https://ift.tt/2E7X14Y
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