A nestar is similar to a gravastar, which is short for gravitational vacuum condensate star.
Like the gravastar, the nestar is an extreme theoretical object, but with a twist.
Our solution to the field equations allows for a whole series of nested gravastars.
An artist’s impression of a nestar, or nested gravastar.Illustration:Daniel Jampolski and Luciano Rezzolla
But at the center of a black hole, general relativity breaks down.
Enter gravastars: Nearly as compact as black holes, with similar gravitational force on their surfaces.
Nestars present a new solution to the old problem… if they exist, of course.
Its a bit like finding a gold coin along a path that has been explored by many others before.
Unfortunately, we still have no idea how such a gravastar could be created, Rezzolla added.
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