Word: proof
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Dates: during 1990-1999
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...this May, NASA revealed data from its Hubble Space telescope providing the best proof yet that black holes are indeed real...
...since a black hole is a theoretical construct that cannot be seen, an absolute proof is going to be difficult to find...
...acceptable proof. Just because people can't think of [something other than a black hole] doesn't mean nature can't Geller says. "There are a lot of things that people don't understand that nature has been doing for some time...
...next step toward understanding the nature of black holes-and perhaps providing stronger proof of their existence to skeptics-is to look for phenomena similar to the M87 gas mass in other galaxies, scientists...
...These documents] provide proof that Harvard is...a plaything of the interlocking government-Pentagon-foundationwolrd which makes American foreign policy," the paper's editors wrote...