Robert Lea is a science journalist in the U.K. who specializes in science, space, physics, astronomy, astrophysics, cosmology, quantum mechanics and technology. Rob's articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space and ZME Science.
A newly developed solution to the equations at the heart of Albert Einstein's most revolutionary theory suggests hypothetical stars called"nestars" could be made from stacked gravitational stars, or"gravastars," like Russian tea dolls, also known as matryoshka dolls.
To that end, another theoretical idea that emerged from general relativity in 2001 is the concept of"gravastars," or compact bodies with dark energy cores. Dark energy is the force that appears to be accelerating the expansion of the universe. In gravastars, scientists believe dark energy would exert a negative pressure to protect the stars against their own inward gravitational forces.
"The nestar is like a matryoshka doll; our solution to the field equations allows for a whole series of nested gravastars," one of the solutions developers, Goethe University theoretical physicist Daniel Jampolski, said in a statement. For most bodies, this co-called Schwarzschild radius would be deep beneath their surface; for the sun, for example, it would be located 1.9 miles from the heart of our star, which has an overall radius of 434,000 miles . But, if a star could collapse and its radius shrank below the Schwarzschild radius, this would result in a body with an outer boundary from which not even light could escape. This led to the concept of the black hole event horizon.
The visual form of black holes, as painted by general relativity, was also incredibly confirmed in 2019 when an image of a glowing ring of material around the supermassive black hole at the heart of the galaxy Messier 87 was revealed to the public by the Event Horizon Telescope collaboration.
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