Thorne-Żytkow object (TZO)

A Thorne-Żytkow object (TZO) is a hypothetical type of stellar object that is formed when a neutron star enters the core of a red supergiant star, and merges with the core. It is named after the American physicist Kip Thorne and the Polish-American astronomer Anna Żytkow, who proposed its existence in 1977. The TZO is expected to have a very dense core of neutron-degenerate matter, surrounded by a large envelope of normal matter from the red supergiant. It is thought that TZOs may be rare, and that they may be difficult to observe.

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