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Another team, led by Gordon Garmire of Pennsylvania State University in State College, has also traced the sources of the high-energy X-ray background and found a multitude of black hole candidates. Reports earlier this year about black hole candidates - many based on observations with the Hubble Space Telescope - beg some fundamental questions: What are the criteria for finding a supermassive black hole, and what constitues the nearest thing to absolute proof? And unlike other recently reported black hole candidates (SN: 1/25/92, p. |
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