black holes (Page 3)

Black holes may enable us to travel to different universes. Physicist Lior Burko says travel through a black hole is theoretically possible, despite the fact that most scientists think the holes would destroy a spacecraft. But Burko says not all black holes are alike.

Black holes are invisible pits of gravity that have no surface, but instead have a spherical “event horizon,” which can be several miles across. Once inside them, light and matter can’t escape, which is why black holes are invisible. At the center of a black hole is a point called a singularity, where matter is crushed to infinite density, making these holes incredibly heavy.
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A supermassive black hole is at the center of our Milky Way galaxy that has a mass 3.7 million times that of the Sun. Like all black holes, it has a strong gravitational attraction that sucks in all matter that comes too close?including light. There is evidence that most galaxies have black holes at the center, just like ours. Until recently, black holes were just a theory, and no one could prove they really existed. But now?”We have been able to exclude some still possible alternative configurations…there is nothing left that one would consider realistic and possible, other than a black hole,” says Dr. Reinhard Genzel
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