However, this region does not exist for black holes that have formed through gravitational collapse, nor are there any observed physical processes through which a white hole could be formed. In addition to a black hole region in the future, such a solution of the Einstein field equations has a white hole region in its past. White holes appear in the theory of eternal black holes. In this sense, it is the reverse of a black hole, which can be entered only from the outside and from which energy-matter, light and information cannot escape. But think of it this way - at one point black holes were considered just theoretical, so maybe it is not so crazy to think that white holes can also exist.In general relativity, a white hole is a hypothetical region of spacetime and singularity which cannot be entered from the outside, although energy-matter, light and information can escape from it. Until astronomers see another event like the one that occurred almost 10 years ago, we can only wait and wonder. However no similar events have happened since to provide any new information about the phenomenon. Scientists may have caught a glimpse of a white hole back in 2006, when they witnessed an explosion of white light that came from nowhere and then vanished. This process can take only thousandths of a second to occur, however according to the researchers, they can continue to appear as black holes lasting billions or trillions of years because of a phenomenon known as gravitational time dilation. At this point, it will exert a pressure called quantum bounce that turns a black hole into a white hole. What this means is that as a star collapses under its own gravity, it will continue to shrink until it cannot shrink anymore. However, some new theories have pointed to the existence of these naked singularities.Īstrophysicists have always wondered whether black holes destroy information when material falls into them, and a model performed in a study published in Nature in 2014 suggests that at the end of their lives, black holes may in fact turn into white holes - spitting out all the material they have ever consumed back into space.Īccording to the model developed by Carlo Rovelli and Hal Haggard from Aix-Marseille University in France, the transformation from a black hole to a white hole would occur right after the initial formation of a black hole by a process called loop quantum gravity. According to the principles of general relativity, the universe can not support these types of singularities because event horizons were primarily introduced to reconcile the issue of spacetime breakdown near black holes. Since white holes are reverse black holes, they would also be formed by a gravitational singularity - a point in spacetime where the gravitational field becomes infinite - however a white hole is a “naked” singularity, meaning it does not have an event horizon. SEE ALSO: Stephen Hawking Proposes New Theory to Resolve Mystery of Black Holes So if a white hole did in fact exist, it would be very unstable and likely only last a few seconds before turning back into a black hole.Īn important constraint to white holes is that they violate the second law of thermodynamics, which states that disorder (“entropy”) in the universe can either remain the same or increase but it can never decrease. However, time can’t go backwards can it? It turns out the theory of relativity does not care if time goes forward or backwards - if it can go one way, it can easily go the other - but as we know, time tends to only move forward. White holes are just a mathematical solution to the laws of general relativity which imply that if black holes exist in the universe, then a white hole should also exist since they are time-reversals of a black hole. We have all heard of black holes, but have you ever heard of white holes? They are hypothetical features of the universe and are considered to be the opposite of a black hole - a black hole sucks in material where nothing can escape, while a white hole spits out matter and nothing can get in.
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