Biggest Black Hole in the center of Galaxy HD documentary

Astronomers are closing in on the proof they've sought for years that one of the most destructive objects in the universe -- a super massive black hole -- lurks at the center of our own galaxy..

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Astronomers are closing in on the proof they've sought for years that one of the most destructive objects in the universe -- a super massive black hole -- lurks at the center of our own galaxy...