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The *entire* sky glows from the light of distant hydrogen. All of it, everywhere.

20 Aug 2020, 13:00 UTC
The *entire* sky glows from the light of distant hydrogen. All of it, everywhere. ESA/Hubble & NASA, ESO/ Lutz Wisotzki et al.

To a large extent, most of the Universe is hydrogen.

It's the simplest element, just a proton and an electron (and honestly, the electron is optional), and it came out of the fires of the Big Bang. Roughly 75% of the non-dark Universe is hydrogen by mass, with 25% being helium, and the tiny remainder is everything else, basically a roundoff error.

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