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As 2012 Comes To A Close, The Facts About Doomsday

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When people have questions about the end of the world — the predictions about the planet Nibiru's collision with Earth or the end of the Mayan calendar — they often turn to the Internet.

For years, NASA astrobiologist David Morrison has taken it upon himself to answer thousands of questions about the science of existential threats on NASA's Q&A site "Ask an Astrobiologist."

There, Morrison debunks and details the origins of popular apocalyptic scenarios and thoughtfully responds to questions like: "If the government knew about Nibiru, wouldn't they keep it a secret to avoid panic?"

He talks with NPR's Neal Conan about what he's learned from the process and whether he'll continue this part of his job in 2013.

Copyright 2012 National Public Radio. To see more, visit http://www.npr.org/.

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