Astronomers Measure the Long Reach of a Quasar
Astronomers have discovered that the quasar H1821_643 emits powerful winds that carry energy far beyond its host galaxy. This finding suggests that supermassive black holes have a much larger impact on their surrounding environment than previously believed.
There are a number of things in the Universe that could wipe out life as we know it, but - for now, and for Earth - a blast from our galaxy's supermassive black hole isn't one of them. That's not to say that Sagittarius A* doesn't pose a danger. If it wakes up someday and blasts out a strong wind, that definitely could affect Earth. It could well have powered a quasar in the past, and could do so again.
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