Tangentially related: Thorne–Żytkow object https://en.wikipedia.org/wiki/Thorne%E2%80%93%C5%BBytkow_object https://en.wikipedia.org/wiki/Thorne%E2%80%93%C5%BByt

Tangentially related: Thorne–Żytkow object https://en.wikipedia.org/wiki/Thorne%E2%80%93%C5%BBytkow_object https://en.wikipedia.org/wiki/Thorne%E2%80%93%C5%BBytkow_obj... A hypothetical red giant that swallowed a neutron star, which sinks into the center and replaces the giant's core. Even at such a scale, the star is relatively stable (i.e., it doesn't go all kaboom immediately) because the matter falling into the neutron core is heated to such a degree that it can balance the inward pressure from gravity.