It’s an interesting question, and one I can’t really answer very well.
I’ve had to do some reading.
The idea of a ‘white hole’ comes from the idea of a ‘black hole’. A black hole is an object in the universe which has such a strong gravitational field that even light (the fastest thing in the universe) cannot travel fast enough to escape the gravitational attraction toward the black hole.
So you can think of a black hole as taking light and matter (stuff) into itself, but not letting it back out.
A white hole is a theoretical opposite. It’s something that only gives light and matter out, and cannot let anything into itself. Light heading straight toward the white hole would be reflected / deflected, and not be able to get in.
We’ve never seen evidence for a white hole, and it’s not clear how such an object could be possible with what we (I) know about science.
One idea is perhaps that the Big Bang counted as a white hole, that it gave out all its matter and energy at a single point. It’s an idea that I’d not come across before 🙂
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