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A black hole is an object--commonly a collapsed star--so dense that even light cannot escape its gravitational field.(THE WEEK)(Brief article)
A black hole is an object--commonly a collapsed star--so dense that even light cannot escape its gravitational field. The term dates from the 1960s; actual black holes have been observed (indirectly, by their effects) since the 1970s. Once the concept had leaked out from astrophysics into general circulation, "black hole" became a natural and expressive way to tag any situation from which nothing useful ever emerges. That is the sense in which it was used at a recent meeting of the commissioners of Dallas County, Texas, in reference to the ...
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Source: HighBeam Research, A black hole is an object--commonly a collapsed star--so dense that...