Question

Are white hole luminous?

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Answer 1

Answer:

You can't go into a white one. So, where a black hole is sucking matter in, a white hole is spewing it out. They would be incredibly bright and incredibly energetic, hurling radiation into space at a furious rate. ... We have never, to our knowledge, actually observed a white hole.

Answer 2

A white hole is a bizarre cosmic object which is intensely bright, and from which matter gushes rather than disappears. In other words, it's the exact opposite of a black hole. But unlike black holes, there's no consensus about whether white holes exist, or how they'd be formed.