hydrogen gas

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Half of the universe’s hydrogen gas, long unaccounted for, has been found: « New measurements of the diffuse ionized hydrogen surrounding galaxies account for missing mass. »

Half of the universe's hydrogen gas, long unaccounted for, has been found

Astrophotographer captures colorful portrait of the Lion Nebula in a glowing field of hydrogen gas

Astronomers Accidentally Find A Galaxy That Hasn’t Birthed Any Stars. A typo sent an enormous radio telescope to the wrong patch of sky — where it discovered an invisible galaxy-sized cloud of hydrogen gas.