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The centre of our galaxy has been known for years to host a black hole, a 'super-massive' yet very quiet one. New observations with Integral, the European Space Agency's gamma-ray observatory, have now revealed that 350 years ago the black hole was much more active, releasing a million times more energy than at present. Scientists expect that it will become active again in the future. <br /><br />SpaceFligtNow link.<p>Okay, here's my question - the radiation from this event would have passed us already, right? They detected it hitting a cloud of gas 350LY away from the SMBH, but we're more than 20,000LY away (and so we're seeing what happened 20,000 years in the past) Does that mean that the radiation is still coming our direction?</p>