{"id":55403,"date":"2024-03-06T08:53:12","date_gmt":"2024-03-06T08:53:12","guid":{"rendered":"http:\/\/1ea53718-c529-4165-8888-fa5d9c010ca6"},"modified":"2024-03-06T09:33:55","modified_gmt":"2024-03-06T09:33:55","slug":"a-white-hole-is-a-time-reversed-black-hole-but-could-one-really-exist-out-there-in-the-cosmos","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/a-white-hole-is-a-time-reversed-black-hole-but-could-one-really-exist-out-there-in-the-cosmos\/","title":{"rendered":"A white hole is a time-reversed black hole, but could one really exist out there in the cosmos?"},"content":{"rendered":"

We’ve all heard of black holes. But what about white holes? Could they really exist? <\/p>

By Marcus Chown\n <\/p>

Published: Wednesday, 06 March 2024 at 08:53 AM<\/p>

\n\n

A white hole is a time-reversed black hole \u2013 a region of spacetime<\/a> where matter spontaneously appears and explodes outwards, rather than implodes and disappears as with a black hole.<\/p>

White holes are the opposite of black holes, in that they spit out light and matter, rather than trapping it.<\/p>

So far, white holes are purely hypothetical objects, but astronomers are contemplating how they could form in reality.<\/p>

No light can escape a black hole, but it can be bent around it. Could a black hole’s opposite, a white hole, really exist? Credit: M. Moscibrodzka, T. Bronzwaer and H. Falcke, Radboud University<\/figcaption><\/figure>
**White hole as the end point of a black hole<\/strong><\/h2>**A black hole<\/a> forms when a massive star at the end of its life shrinks catastrophically under its own gravity down to an infinitesimally small point, or singularity.<\/p>
All that is left behind from the stellar collapse is a grossly warped region of space, so where does the star\u2019s matter actually go?<\/p>
One possibility is that it explodes into another universe as a white hole.<\/p>
$\"An$
An artist’s impression of a wormhole. Credit: M. A. Garlick\/Wikipedia Creative Commons<\/figcaption><\/figure>
The white hole has to be in another universe, because the defining characteristic of a black hole is that the event horizon, which hides the singularity from view, is one-way.<\/p>
In other words, things that fall through it can never emerge again in our Universe.<\/p>
For matter to pass between universes, the black hole and white hole must be connected by a wormhole<\/a> \u2013 a tunnel through spacetime.<\/p>
Some scientists suggest super-energetic objects such as quasars<\/a> are white holes, and perhaps even the Big Bang was a gigantic version.<\/p>
***Do you think white holes and worm holes could exist? Let us know your thoughts by emailing*** ***contactus@skyatnightmagazine.com<\/a><\/em><\/strong><\/p> <\/body><\/html>\n***
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