How Astronomers Measured the Edge of a Black Hole

For the first time, astronomers peered to the edge of a massive black hole at the heart of a distant galaxy and measured its "point of no return." Shep Doeleman, assistant director at MIT's Haystack Observatory, shares some of the black hole's deepest (and darkest) secrets.

Source: http://www.npr.org/2012/10/05/162372197/how-astronomers-measured-the-edge-of-a-black-hole?ft=1&f=1007

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