Two elements hint Cas A underwent a quark nova — a theoretical explosion that leaves behind a quark star — just days after the original supernova.

The Case of Missing Iron in Cassiopeia A

Are double-humped super-luminous supernovae happening when a neutron star converts to a quark star?

Are double-humped super-luminous supernovae happening when a neutron star converts to a quark star?

The 2012 discovery of the Higgs boson, or.

The sizes of a neutron star and a quark star compared to the Grand Canyon. The smallest, most massive, most compressed neutron star possible is about 17 kilometers in diameter. A quark star can be smaller than 11 kilometers diameter. The canyon is 29 kilometers from rim to rim. In reality this scene couldn't exist; the entire Earth would collapse almost instantly to a thin layer coating the surface of either superdense star. Illustration by D. Berry / Chandra X-ray Center.

Two groups of astronomers say they have found superdense objects even smaller and weirder than neutron stars, and made of a substance like nothing else in the universe.

A white dwarf, a neutron star or even a strange quark star are all still made of fermions. The Pauli degeneracy pressure helps hold up the stellar remnant against gravitational collapse, preventing a black hole from forming.

Ask Ethan: What's The Difference Between A Fermion And A Boson?

In a neutron star (left), the quarks that comprise the neutrons are confined inside the neutrons. In a quark star(right), the quarks are free, so they take up less space and the diameter of the star is smaller. (Illustration: NASA/CXC/M.

Quark Star Plays Role in New Theory for Brightest Supernovae

Artist illustration of supernova. Credit: NASA An exploding star in our home galaxy might be visible to Earth in the next 50 years, astronomers say in a new calculation of the odds of a nearby supernova.

Neutron stars tend to lie in the range of 1.4 to 2 solar masses. Any star with a neutron star’s density that’s over 10 solar masses has to become a black hole. That leaves a bit of a gap, although there is evidence of stellar black holes down to only 3 solar masses. The theoretical gap for strange stars to form may only be in the 2 to 3 solar masses range.

Astronomy Without A Telescope - Strange Stars - Universe Today

What are Quark Stars?

Astronomers have theorized there could be an intermediate stage between neutron stars and black holes called quark stars.

Complete baby's nursery with this gorgeously soft, star shaped rug - Pink, Blue or Grey colours complement lots of different nursery themes

Star Nursery Rug

Like: matches wallpaper

Quark stars: How can a supernova explode twice?

What do you get when you melt a neutron star? An unimaginably dense lump of strange matter and a whole new celestial beast, says Anil Ananthaswamy

Structure of Quark Star vs Neutron Star

Structure of Quark Star vs Neutron Star

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