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Who's Afraid Of A Big Black Hole?

BBC Knowledge October 1, 2010

Weighing in at up to 4 million times the mass of the Sun, the biggest super massive black holes have the power to rip planets apart and swallow entire stars. Their gravitational pull is so strong that nothing, not even light, can escape. And that's a problem for astronomers, because it means they're entirely invisible to any telescope. Despite these obvious obstacles, the program meets the astronomers attempting to image a black hole for the very first time and the theoretical physicists getting ever closer to unlocking their mysteries.

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