Half of the universe's hydrogen gas, long unaccounted for, has been found
Half of the universe's hydrogen gas, long unaccounted for, has been found
phys.org
Half of the universe's hydrogen gas, long unaccounted for, has been found
13 comments
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Was it in the couch cushions? That's where I often find things.
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Surprised jd vance face
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If I understood this correctly, they analyzed incredibly blurry images and concluded that there are clouds of gas around galaxies, then they extrapolated the found gas up to all or almost all galaxies and concluded that it can fulfill the calculated expectations.
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What I understood is kind of the opposite–they already knew there were hidrogene clouds around galaxies but analyzed some almost imperceptibly blurry images and found they were bigger than currently thought. They're blurry because they were taken in some wavelength not observable until now that is scattered by the ionized gas.
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Thank you. Saved me a click?
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Astronomers have generally thought that massive black holes at the centers of galaxies expel gas in jets of material only during their formative years, when the central black hole is gobbling up gas and stars and producing lots of radiation. This makes them stand out as what astronomers call active galactic nuclei (AGN), or quasars.
If, as the new study suggests, the ionized hydrogen halo around galaxies is more diffuse, but also more extensive, than thought, this implies that the central black holes may actually become active at other times in their lives.
I love how we keep finding more and more about the role that black holes play in our universe.
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Astronomical bookkeeping 🥴
Hydrogen alienation is a crime.
13 comments
It's always in the last place you look.
Because you stop looking...
Yes, that's the joke.