5 years ago
All the Light There is to See? 4 x 10⁸⁴ Photons.
In one of those exercises that you think should be impossible or perhaps a punishment for some infraction, a team of astronomers has now measured the total amount of light that has ever been produced by all the stars in our universe. The answer, expressed in terms of quantum particles of light known as photons, is 4 trillion trillion trillion trillion trillion trillion trillion. In scientific notation that is 4 x 10⁸⁴, or, if you like, a 4 followed by 84 zeros...
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https://www.nytimes.com
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