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| MyCn18, a young planetary nebula located about 8,000 light-years away |
From Physics arXiv:
"Clearly, the centre of our galaxy was once much more active, perhaps even in the time since the American War of Independence.
"Today, Meagan Lang at Vanderbilt University in Nashville and a few pals say they think they can explain all this activity.
"Their idea is that a small satellite galaxy recently smashed into the Milky Way, bringing with it stars, gas and a huge black hole some 10,000 times more massive than the Sun.
"Here's what they say happened. The new black hole spiralled into our own, but not before slinging away most of the older stars from the galactic centre. Much of the new dust was devoured by our own supermassive black hole, causing it to belch gamma ray-emitting jets into intergalactic space. The Fermi Bubbles are the remnants of these. The rest of the dust became a maelstrom of turbulence, perfect conditions for triggering the star formation we see today."
Physics arXiv: Satellite Galaxy Merger, or
Satellite Galaxy Merger
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