Word: holeâ
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...Some 50 billion years from now, the galaxies will crush together to form the ultimate singularity?a single gigantic black hole???and the universe will cease to exist. Wheeler, for one, sees no escape from what he calls "this final crunch." Says...
...point of no return that scientists call the black hole's "event horizon." Anything crossing this border would be stretched spaghetti-thin, pulverized by gravitational tidal forces, and sucked into the singularity. To an observer outside?say an astronaut watching his abandoned craft plunge into the black hole???the result would be different. Because of relativistic effects, the spacecraft would appear to move ever more slowly, and closer and closer to the event horizon, without ever reaching...
Unlike Laplace's dark star, this Einsteinian black hole???the name was not coined by Physicist Wheeler until the 1960s?had far more finality. Since relativity forbids anything to move faster than light, an idea unknown in classic Newtonian physics, escape was impossible. All the energy in the world could not extract an object from a black hole...
...this telltale radiation that was apparently detected from Cygnus by the pioneering Uhuru and Copernicus X-ray satellites. A similar partnership of two stars?one of them also a black hole???may be responsible for the X rays that are being picked up from Scorpius...
...ground trembled and the sky darkened with clouds of dust as the volcanic eruptions began. Startled, the animals gathered at the water hole???hyenas, saber-toothed tigers, giant elephants ?took off in a great stampede. Joining in the flight were small creatures that though they looked like apes, walked upright. Before long, the rain of volcanic ash had completely buried the site and all signs of the life around...