If the universe is closed, if one watches the stars, their light would be visible on the opposite side of the sky. If our universe lies "within" another universe,"the prediction would be that our universe is closed," Poplawski said. The same would hold true if the universe is open, "only it would be 'curved,'" Poplawski said.This means that if two beams of light were shot into space parallel to each other, in a flat universe they would stay parallel, while in an open universe they would actually get farther from each other. If our universe is flat, and one tries to venture to its edge, one would never reach it, as it continued on infinitely.
If it is closed, and one tries to venture to the edge of our universe, one would eventually loop back to where one started."It would be like walking on the surface of the Earth - if you walk to the east, at some point you come back across the west," Poplawski said. "The first is that it's closed, the second is that it's 'open,' and the third is that it's 'flat.'" "In cosmology, there are three models for our universe,"Poplawski explained. So how might one test this conjecture? One implication of Poplawski's concept is that our universe is "closed." If our universe was born from a black hole in another universe, it would be impossible to cross its event boundary and see the other side, meaning one cannot prove or disprove this idea that way. "We would just be disconnected from the other universe," he said. This does not mean any universe at the other end of the black hole would cease to exist, Poplawski explained. In theory, black holes do lose mass, however, as Hawking radiation- particles that emerge from the vacuum right next to their event horizons.Black holes that lose more mass than they gain are expected to shrink and ultimately vanish. The event horizon of a black hole is ?boundary at which nothing inside can escape. If anyone survived a trip into a black hole and emerged in another universe, "it would be a one-way trip," Poplawski noted. "Our universe was small a long time ago and expanded," Poplawski said."From the other side, one would not see our expansion." Essentially, a black hole could seem bigger on the "inside" than how it looked to someone outside. Although a black hole forming from a star the size of our sun would only be about 2 miles wide, it does not mean that a universe which might originate from a black hole would stay that small.
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