![]() Anything on the outside of a white hole would never be able to get inside it, because it would have to travel faster than the speed of light to cross inward through the event horizon.īut if white holes are allowed by the math of general relativity, then why don't we suspect that they exist in the real universe? The answer is that general relativity is not the only word on the cosmos. But any material that entered a white hole would immediately get ejected at a speed greater than that of light, causing the white glow to shine ferociously. They would still be massive, gravitating objects. They would still have singularities at their centers and event horizons at their borders. White holes would be even stranger than black holes. This is a white hole, and according to general relativity, this scenario is perfectly fine. Eventually, it would explode, leaving behind a massive star. So if we were to take a movie of the formation of a black hole and run it in reverse, we would find an object streaming radiation and particles.
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