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