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HOW MANY ELECTRONS ARE THERE IN THE UNIVERSE?
November 2025
|BBC Science Focus
It's difficult to know for sure how many electrons are in the Universe. British physicist Arthur Eddington (1882-1944) came up with a number in 1938, now known as the 'Eddington number'.
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Eddington's calculation was actually for the number of protons in the Universe, but based on our knowledge of the physics of the early Universe, and the known strength of the electromagnetic force, we can assume this is the same as the number of electrons. Eddington's number was 1.57 x 1079.
Unfortunately, this estimate was based on rather dubious physics. More modern estimates put this number slightly higher, at almost 1080 (that's 1 followed by 80 zeros).
هذه القصة من طبعة November 2025 من BBC Science Focus.
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