A new study suggests that the collapse of a massive star could create an expanding mini-universe instead of a universe Black hole. The resulting object, called a gravastar, will avoid the singularity and event horizon that make black holes so puzzling.
Massive stars produce light and heat through nuclear fusion in their cores. This process generates outward pressure that balances the inward pull of gravity. But when a very massive star runs out of fuel, this support disappears. Gravity takes over, causing the star to collapse inward until it reaches what physicists call a singularity, the point at which matter is compressed to an extreme state.
Although Black holes Although it is widely accepted as the end result of this collapse, it raises some profound questions. How can the mass of billions of suns be compressed into a single point? How can spacetime become infinitely curved at a singularity? At that point, the known laws of physics no longer provide reliable answers, making it impossible to predict what will happen next. Black holes also mask everything outside their event horizons, meaning matter, energy, and even light can no longer be observed once they cross those boundaries.
Gravastars as an alternative to black holes
Because of these challenges, some scientists have explored the possibility that black holes can actually be different types of objects. One suggested alternative is a Gravastar, short for Gravitational Vacuum Star. These ultra-small hypothetical objects would be nearly impossible to see due to their intense gravity.
Unlike black holes, gravastars have ordinary matter in their outer layers, while their interiors are filled with dark energy. This mysterious form of energy would generate outward pressure that counteracts gravitational collapse. As a result, gravastars can remain as massive and compact as black holes without having a singularity or event horizon.
While gravastars have long attracted interest as a theoretical possibility, one key question has remained unanswered: How might they actually form?
Einstein’s equations and the microcosm
Theoretical physicists Daniel Jampolski and Professor Luciano Rizzola have now developed what they describe as the first dynamical solution to Albert Einstein’s equations in general relativity that explains how a collapsing star can become a gravitational star.
Their work suggests that during the collapse of a massive star, a miniature universe could emerge within the collapsed material. According to researchers, this process is similar Big bang Which gave rise to our universe. As dark energy is thought to be driving the expansion of our universe, it will also support the growth of this newly formed mini-universe.
As the microcosm expands, it is pushed outward against the star’s gravitational collapse inward. This opposing force could stop the collapse before the black hole forms. Eventually, an equilibrium develops between the expanding mini-universe and the collapsing stellar material. This balance creates a stable Gravastar.
According to the researchers, this solution provides the first explanation for a problem that scientists have been discussing for about 25 years: how gravastars can arise from the collapse of ordinary matter.
New possibilities in extreme physics
“The Big Bang of the nascent universe could unfold once the star has already collapsed to the point of almost becoming a black hole,” explains Daniel Jampolski, who discovered the solution while completing his master’s thesis under the supervision of Luciano Rizzola.
The behavior of matter under such extreme pressure is still poorly understood, leaving open the possibility of new physical effects. As Jampolsky notes: “It is easier to imagine that the Big Bang occurred only at a very late stage, when matter was already compressed to an extreme degree, giving rise to new effects.”
Rizzola, professor of theoretical astrophysics at Goethe University, stresses that exploring alternatives does not mean ruling out black holes. He adds: “The search for alternatives to black holes should not indicate skepticism towards black holes, which still represent the most natural and simplest solution to the fate of gravitational collapse. However, as scientists in general, and as theoretical physicists in particular, it is necessary to maintain an unbiased approach to what we do not know, and thus explore both accepted wisdom and the most exotic explanations. History teaches us that it is not uncommon for the latter to become the former.”
Reference: “Gravastar formation” by Daniel Jampolski and Luciano Rizzola, June 11, 2026, Physical review d.
doi: 10.1103/c6lw-nx7k
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