A Cosmologist Explains How Quark Stars Form

First, cram several suns’ worth of mass into a volume no bigger than a typical city, and imagine they are primarily made of free-floating quarks, one of the building blocks of all atoms.
Astrophysicists haven’t found any yet, but quark stars are made of the “strange” type of quark, and their discovery could open new avenues of research.

A Cosmologist Explains How Quark Stars Form

Exploring the First Microsecond of the Cosmos – The Cosmic Companion

Hubble's law - Wikipedia

Recreating Big Bang matter on Earth

How do we know the timeline of our Universe? - Big Think

The Mystery of Quark Stars

Schematic structures of quark stars and neutron stars.

Universe, Free Full-Text

Quark deconfinement drives supernovae in blue supergiant stars, say astrophysicists – Physics World