Astronomers Just Measured The Total Amount Of Light Ever Produced By All The Stars In The Universe And The Number Is Insane

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This is one of those things you may think is impossible to comprehend or measure but a group of astronomers has now measured the overall amount of light that has ever been produced by all the stars in the known universe. The answer to this is stated in terms of quantum particles of light known as photons. So, the total number of photons produced by all the stars in the known universe is 4 trillion trillion trillion trillion trillion trillion trillion.


This number can be expressed in scientific notation as 4 x 10⁸⁴, or, if you prefer, a 4 followed by 84 zeros: 4,000,000,000,000,000,000,000, 000,000,000,000,000,000,000, 000,000,000,000,000,000,000, 000,000,000,000,000,000,000.

The research paper has been published in the journal Science by Marco Ajello and his team. Marco Ajello is an astrophysicist at Clemson University. This number is, no doubt, huge but the universe is incredibly vast, and in the grand cosmic scheme of things all of this light delivers about as much illumination as a 60-watt bulb observed from 2.5 miles away.

Acco4ding to estimates by astronomers, the observable universe, a bubble 14 billion light-years in radius, comprises at least two trillion galaxies and a trillion trillion stars in total.

Most of these galaxies and stars are way too far and too dim to be observed with any telescope known to humans. But according to the team of this research:

“All the energy ever radiated by these stars is still with us, filling the universe with a sort of fog, a sea of photons known as the extragalactic background light.”

You can read the research paper here.

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