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View Full Version : Milky Way's Black Hole Gave Off a Burst 300 Years Ago



Fraser
2008-Apr-15, 07:50 PM
Our Milky Way's black hole is quiet - too quiet - some astronomers might say. But according to a team of Japanese astronomers, the supermassive black hole at the heart of our galaxy might be just as active as those in other galaxies, it's just taking a little break. Their evidence? The echoes from a [...]

More... (http://www.universetoday.com/2008/04/15/milky-ways-black-hole-gave-off-a-burst-300-years-ago/)

Noclevername
2008-Apr-15, 07:57 PM
Er, you mean it happened 300 years before the gas flouresced, not 300 years ago, right? 'Cause the light still had to get from there to here...

trinitree88
2008-Apr-15, 11:11 PM
Er, you mean it happened 300 years before the gas flouresced, not 300 years ago, right? 'Cause the light still had to get from there to here...

Noclevername. Right. Good thinking. The black hole was a million times brighter as it flared. That radiation passed us by about three hundred years ago, and now we are seeing the light echo from the gas cloud that received that radiation with a 300 year time delay out....there(galactic center).. Now, the flare should be seen illuminating the stuff away from the galactic center in the opposite direction from us....towards the spiral arms. pete

JESMKS
2008-Apr-16, 04:15 PM
Isn't the galactic center (black hole) some 40,000 light years (plus or minus) from earth? The burst must have happened a long, long time ago.

tdvance
2008-Apr-16, 05:04 PM
since time is relative (only space-time is absolute) anyway, I'd suggest using a convention that if the light from an event reaches us 300 years ago, the event happened 300 years ago from our point of view.