How Astronomers Measured the Edge of a Black Hole

NPR | Oct. 05, 2012 10:41 a.m.

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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.