Weird particle soup may have formed stars in the early universe

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Pions are particles that usually decay very quickly. But right after the big bang, they could have made stars that last long enough for us to detect now

Exotic star-like objects made up almost entirely of subatomic particles called pions could have formed in the earliest fractions of a second after the big bang. If proven to exist, these cosmic oddballs would be one of the strangest additions to the stellar catalogue.

Pions are lightweight particles formed from just two quarks, as opposed to more familiar matter like protons and neutrons, which each contain three quarks. The universe was suffused with a primordial pion soup one-ten-thousandth of a second after the big bang, and this …