Weird particle soup could form enormous stars

摘要

EXOTIC starlike objects made almost entirely of particles called pions could have formed in the early universe. If proven to exist these cosmic oddballs would be one of the strangest additions to the stellar catalogue. Pions are light, containing just two quarks, as opposed to more familiar matter like protons and neutrons, which each contain three quarks. The universe was bathed in a primordial pion soup one-ten-thousandth of a second after the big bang.