My current interest is black holes and quasars. I was wondering how often they erupt--specifically ours? Would it be blindingly bright on Earth? Finally, would there be any effects that would alter our life on Earth that we know of?
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2$\begingroup$ At least it was somehow active 2.5 to 4.0 million years ago according to this talk by Andrew Fox at the AAS2015, click "The Milky Way & Local Group", watch 15 minutes into it. And that event created the huge Fermi Bubbles. It indicates to me that it happens often and is harmless to us. $\endgroup$– LocalFluffCommented Jan 21, 2015 at 8:48
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1$\begingroup$ possible duplicate of Was the Milky Way ever a quasar? $\endgroup$– David HammenCommented Jan 21, 2015 at 13:56
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$\begingroup$ @LocalFluff Very cool! What I gathered from that, combined with other information I've picked up, is that there is usually always something being forced out from a black hole pending on how much it is accumulating. That being said, it seems like since it's not a very active black hole that is does not have a quasar. $\endgroup$– ScottCommented Jan 22, 2015 at 1:51
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To answer your question, the black hole in the milky way was never a quasar, and as it currently stands will never become one.
Info about how earth and life on earth could be affected if this ever happened, can be found here.
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$\begingroup$ That was a very good video. It cleared up a lot of misconceptions I had as well. Thanks! $\endgroup$– ScottCommented Jan 22, 2015 at 2:18