Closing in on black holes
Jan 25, 2004
The black hole at the centre of our galaxy
has a strong influence on its surroundings.
Astronomers cannot yet see this 3.6 million
solar mass behemoth directly but they have
now witnessed flashes of infrared light emitted
breathtakingly close to its event horizon. Remarkably, they observed periodic bursts of infrared radiation coming from the black hole which, they say, is evidence for its rotation (R Genzel et al. 2003 Nature 425 934)
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