Ultrahela

Ultrahela refers to a hypothetical type of stellar remnant that could form from the complete collapse of a massive star. Unlike neutron stars or black holes, ultrahela would be an object of extremely high density, potentially exceeding that of neutron star matter. The theoretical concept of an ultrahela arises from exploring the limits of gravitational collapse and the behavior of matter under extreme pressure.

The formation of an ultrahela is theorized to occur in scenarios where the core of a massive star, after exhausting its nuclear fuel, collapses under its own gravity. If the collapse is not halted by the neutron degeneracy pressure that forms a neutron star, and if it doesn't directly form a black hole, it could potentially lead to the formation of an ultrahela. This object would possess an immense gravitational pull, though its exact properties and observational signatures remain speculative.

Current astrophysical models do not definitively confirm the existence of ultrahela. They are primarily theoretical constructs that explore the boundaries of known physics. Further research into stellar evolution and the physics of extreme matter might shed more light on whether such objects are possible and how they could be detected. The concept of an ultrahela challenges our understanding of the final stages of stellar life and the nature of compact objects in the universe.