There is the possibility that there are so-called "stealth stars" in the universe The hypothetical quark star is one of the "should be" objects. But there is no single observation of that type of star. Theoretically, quark stars are the medium between neutron stars and black holes. But why we cannot see that thing? Could the reflection that comes from free quarks have a wavelength that we cannot observe? The free quarks will send the radiation that has so short wavelength that we cannot observe that radiation because we have no object that resonates with that thing. What if radiation comes straight from the surface of quarks? Normally the radiation comes from the quantum fields of atoms or protons and neutrons. But if there are free quarks somewhere in the universe, those quarks would send radiation that has so short wavelength that we cannot see that thing. So does that thing explain, why we have no observations about the hypothetical quark stars? Are those object...