With all the stars in our universe, many of which are several lightyears away, it is an enormous task to measure how much light they have produced and emitted throughout history. But now, astronomers have been able to quantify 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.
The first stars flickered into being a few hundred million years after the big bang. Since then, galaxies have churned out stars at a stupendous rate, and scientists estimate there were now about a trillion trillion.
(Image credit: Wikimedia Commons)
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