Physicists Just Found the Last Missing Protons and Neutrons In the Universe
“The universe’s missing matter has been found, and it’s floating between the stars.
Researchers who study the ancient history of the universe know how much ordinary matter — matter that makes up baryons, a class of subatomic particles that includes protons and neutrons — the universe created during the Big Bang. And researchers who study the modern universe know how much ordinary, baryonic matter humans can see with telescopes. [https://www.livescience.com/13613-strange-quarks-muons-nature-tiniest-particles-dissected.html]
But until recently, those numbers didn’t match up: A full third of the universe’s original baryonic matter was missing. Now, thanks to a clever observation involving an incredibly bright black hole, an international team of researchers says they’ve found it.
The missing baryons, the researchers wrote in a study https://www.nature.com/articles/s41586-018-0204-1 today (June 21) in the journal Nature, have been hiding out as thin, hot clouds of oxygen gas floating between the stars…”
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