Giant Milky Way bubbles blown by black hole merger

[Sheila]

http://www.newscientist.com/article/dn23248-giant-milky-way-bubbles-blown-by-black-hole-merger.html

 

A tiny galaxy that collided with the Milky Way spawned two huge bubbles of high-energy particles that now tower over the centre of our galaxy. This new model for the birth of the mysterious bubbles also explains discrepancies in the ages of stars at the galactic middle.

[Perkil8r]

I wonder if, 10 million years (or so) ago if we had been around with today's technology, if we might have been able to see this merger? Very interesting stuff, quite how they work it out is beyond me.