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exotic star
An exotic star is a hypothetical compact star composed of something other than electrons, protons, neutrons, and muons; and balanced against gravitational collapse by degeneracy pressure or other quantum properties. These include quark and strange stars (composed of quark or strange matter) and the more speculative preon stars (composed of preons). Exotic stars are largely theoretical, but candidates for such objects are occasionally seen.
==Quark stars and strange stars==
(詳細はneutrons into their constituent up and down quarks under gravitational pressure. It is expected to be smaller and denser than a neutron star, and may survive in this new state indefinitely if no extra mass is added. Effectively, it is a very large nucleon. Quark stars that contain strange matter are called strange stars.
Based on observations released by the Chandra X-Ray Observatory on April 10, 2002, two objects, designated RX J1856.5-3754 and 3C58, were suggested as quark star candidates. The former appeared much smaller and the latter much colder than expected for neutron stars, suggesting that they were composed of material denser than neutronium. However, these observations were met with skepticism by researchers who said the results were not conclusive.. After further analysis, RX J1856.5-3754 was excluded from the list of quark star candidates.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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