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A white hole is just a theoretical object that could exist, but frankly, doesn't probably exist. And that's the general consensus
Not only are we unable to explain how a white hole could even exist, we haven't even detected any white holes in the observable universe, nor anything akin to them.
The closest thing that gets to white holes would be negative mass, but negative mass, if it exists, couldn't even clump together to form a white hole, and even then, negative matter is super speculative too.
It's basically shifted into a mathematical exercise