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+ - Milky Way's black hole wasn't always such a wimp->

Submitted by scibri
scibri (2544842) writes "Sagittarius A*, the dormant supermassive black hole that lies at the centre of our galaxy, was much more active than today not that long ago. Astronomers using the the Fermi Gamma-ray Space Telescope have picked up some faint gamma-ray signals that suggest that Sagittarius A* was emitting a pair of powerful gamma-ray jets like other galactic black holes as recently as 20,000 years ago (Arxiv paper).

If our black hole was more active in the past, it could explain why Sagittarius A* seems to be growing about 1,000 times too slowly for it to have reached its current mass of about four million solar masses since the Galaxy formed about 13.2 billion years ago."

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Milky Way's black hole wasn't always such a wimp

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