Is it possible for a quark star to exist?

Scientists don't have strong evidence yet for the existence of quark stars, suns made of these elementary subatomic particles instead of protons or neutrons.

Neutron stars may contain free quarks – Physics World

Four crazy stars astronomers think might really exist

Quark Matter — A New State of Being - The Cosmic Companion

Quark Stars Get Real, Science

What are Quark Stars? - Universe Today

Near-Certain Discovery of Quark Matter in Neutron Stars

A quark star may have just been discovered - Advanced Science News

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Four Crazy Stars Astronomers Think Might Really Exist

Has A Quark Star Just Been Discovered?

Could the source of the GW190814 event be a black hole-strange quark star system?

Weird new form of nuclear matter might lie just beyond experimenters' grasp, Science

Quark star, Beyond Universe Wiki