So in the black hole, you can pass inwards, but not outwards in a white hole, you can pass outwards but not inwards. With a white hole, you have an event horizon, where stuff from the inside crosses the event horizon and gets ejected into the universe, and you can't actually get into the white hole. So a white hole is almost like anti-gravity endlessly ejecting material. Gravity has got you, and your future is destined to be at the center of the black hole, no matter what you do. You cross that event horizon, and then you are captured, you cannot escape from that black hole. So in a black hole, you have an intense gravitational field that pulls things in you've got this one-way membrane called the event horizon. The white hole is, in a hand-wavy sense, the inverse of a black hole. How do white holes differ from black holes? So as well as a black hole, the mathematics of Schwarzschild also gives us a white hole by just flipping the way that time works. That's where gravity is attractive, but you could also choose the opposite direction in which time flows and get the opposite effect. You could point the clock in this particular direction, and that's what gives you this picture where things fall into a black hole. He had to make a choice, there is nothing in general relativity that dictates which direction time flows in. Schwarzschild was the guy who wrote down the mathematics that describes black holes in the universe as completely collapsed objects. White holes emerge from the solutions of Einstein's theory of general relativity devised by Karl Schwarzschild in 1916, just a year after the theory was first published. Geraint Lewis is a Professor at the University of Sydney, who specializes in the use of the phenomenon of gravitational lensing as predicted by general relativity to probe the structure of the universe.
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