Mysterious cosmic dustball fires up Milky Way's black hole The supermassive black hole at the center of our galaxy has become a lot more active in the last year, and now the scientists think they've worked out why. The black hole, dubbed Sagittarius A*, has been monitored by space telescopes for the last 15 years. It usually emits a bright X-ray flare – generated about every ten days …
"The supermassive black hole at the center of our galaxy became a lot more active about 25,900 years ago..."
Yes, but is an event-horizon X-ray flare still an event-horizon X-ray flare if there's no-one there to observe it?
To put it another way, if a man says something in a silent forest, but his wife isn't there to hear him, is he still wrong?
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