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As far as I know, the only evidence of a supermassive black hole (SMBH) at the center of our Milky Way has been it's gravitational effect on stars that zip around near the center of our galaxy and a radio signature. That's about to change in 2013 when a stream of ionized dust and gas begin it's death spiral into the void. It should be really cool to see our very own SMBH transform from the invisible monster it is into a brightly lit monster! Hopefully it will be bright enough to see visually.
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