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Astronomers measure total starlight emitted over 13.7bn years

Stars have radiated 4x1084 photons since the universe begun with formation peaking 11bn years ago

All the light from all the stars that have ever existed. It is a quantity of unimaginable magnitude, but now astronomers have put a number on it.

From the earliest, faintest stars, to the largest galaxies, an international team has managed to measure the total amount of starlight emitted over the entire 13.7bn-year history of the universe.

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from World news | The Guardian https://ift.tt/2Qumzis
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