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This question is about celestrial objects which are composed by exotic matter, and exotic matter I define as

states of matter that are not commonly encountered such as Bose–Einstein condensates, fermionic condensates, nuclear matter, quantum spin liquid, string-net liquid, supercritical fluid, color-glass condensate, quark–gluon plasma, [...] but whose properties are entirely within the realm of mainstream physics. [Bold text from me.]

The most obvious candidate is a neutron star (see ), but I also heard about hypothetical exotic stars like the Quark star, but I am unsure how hypothetical those are. I am after exotic matter objects which could (at least theoretically) be somehow observed.

I stumbled upon the Space.com article These 'Strange' Alien Planets May Be Made of Exotic Matter:

However, previous research also indicated that planets made of strange matter could exist and that scientists might distinguish these planets from planets made of conventional matter via their densities. Normal planets have densities that are no more than 1,870 lbs. per cubic foot (30 grams per cubic centimeter). In contrast, strange planets would typically have densities of nearly 25 million billion lbs. per cubic foot (400 trillion grams per cubic centimeter), Geng and his colleagues said. (For comparison, gold has a density of about 1,200 lbs. per cubic foot, or nearly 19.3 grams per cubic centimeter.)

This adds strange matter exoplanets to my list of exotic matter astronomical objects, isn't it? Are there other exotic matter objects I am missing?

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    $\begingroup$ I think a red dwarf old enough to have fused its hydrogen reserves to helium, and then cooled enough to become superfluid would qualify. But as they stay in main sequence for trillions of years, probably none reached this state yet. $\endgroup$
    – ksousa
    Commented Mar 9, 2021 at 16:05
  • $\begingroup$ More of a red dwarf remnant. $\endgroup$
    – ksousa
    Commented Mar 9, 2021 at 18:17
  • $\begingroup$ White dwarfs are a little exotic too, but maybe not exotic enough? $\endgroup$
    – Kristoffer Sjöö
    Commented Mar 9, 2021 at 21:21
  • $\begingroup$ @KristofferSjöö White dwarves are indeed exotic enough, I forgot to mention them in my question. Thanks. $\endgroup$
    – B--rian
    Commented Mar 9, 2021 at 22:24

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