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SPACE-HOLES
RTRAOO 
January 14, 2000 
Two teams of astronomers using the Hubble Space Telescope and ground-based telescopes in Australia and... 
Washington, USA 
ISOLATED STELLAR MASS BLACK HOLES ADRIFT AMONG THE STARS. 
Two teams of astronomers using the Hubble Space Telescope and ground-based telescopes in Australia and Chile have discovered the first examples of isolated stellar-mass black holes adrift among the stars in our galaxy. Two images of a crowded starfield as seen through a ground-based telescope show the subtle brightening of a star due to the effect of gravitational microlensing, where an invisible but massive foreground object passes in front of the star and amplifies its light. The object is estimated to be a six-solar-mass black hole that is drifting alone among the stars.

SSF/JP 
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