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Science and The Universe

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Rotating black holes

 

A spinning star could collapse into a ring of neutrons, which would remain stable because of the intense centrifugal force pushing outward, canceling the inward force of gravity. The astonishing feature of such a black hole was that if you fell into the Kerr black hole you could not be crushed to death. Instead, you would be sucked completely through the Einstein-Rosen bridge to a parallel universe. “Pass through this magic ring and- presto!-you’re in a completely different universe where radius and mass are negative!” Kerr exclaimed to a colleague, when he discovered this solution.

The frame of Alice’s looking glass, in other words, was like the spinning ring of Kerr. But any trip through the Kerr ring would be a one-way trip. If you were to pass through the event horizon surrounding the Kerr ring, the gravity would not be enough to crush you to death, but it would be sufficient to prevent a return trip back through the event horizon.

In some sense, a Kerr black hole can be compared to an elevator inside a skyscraper. The elevator represents the Einstein-Rosen bridge, which connects different floors, where each floor is a different universe. In fact, there are an infinite number of floors in this skyscraper, each one different from the others. But the elevator can never go down. There is only an “up” button, Once you leave a floor or universe, there would be no turning back because you have passed an event horizon.

Numerous universes might have been botched and bungled throughout an eternity, ere this system was struck out; much labor lost, many fruitless trials made, and a slow but continual improvement carried out during infinite ages in the art of world-making...
David Hume & Claudio

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A concept image shows the Ares I crew launch vehicle during ascent. NASA has issued a request for proposal for the Ares I launch vehicle upper stage element. The proposals are due to NASA's Marshall Space Flight Center in Huntsville, Ala., no later than 1 p.m. CDT April 13, 2007.

Image above: Concept image of Ares I crew launch vehicle. Image credit: NASA/MSFC

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