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Space tourist Dennis Tito celebrates after his landing near the Kazakh town of Arkalyk on May 6, 2001. Alexander Nemenov/AFP/Getty Images hide caption

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Alexander Nemenov/AFP/Getty Images

First Space Tourist Sets Sights On A Mars Mission

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Researchers who studied pieces of the meteor collected near Lake Cherbarkul say it was a common chondrite meteor. The largest of the 53 fragments was one centimeter in diameter. Photo provided by the Urals Federal University Press Service. Alexander Khlopotov/AP hide caption

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Alexander Khlopotov/AP

Russia Meteor Renews Focus on Asteroid Threats

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1 Week Later: Following Up On Destructive Meteorite

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"All these possibilities are out there. And we live in the one that is hospital to our form of life." — Brian Greene James Duncan Davidson/TED hide caption

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James Duncan Davidson/TED

Is Our Universe The Only Universe?

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Scientists Seek More Information On Meteorite

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"We should search because it tells us how to collaborate our place in the cosmos." — Jill Tarter TED / James Duncan Davidson hide caption

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TED / James Duncan Davidson

Are We Alone In The Universe?

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Phil Plait knows the secrets to avoiding a big asteroid catastrophe. Courtesy of TED hide caption

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Courtesy of TED

How Can We Defend Earth From Asteroids?

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Nobel Prize winner Saul Perlmutter explains part of his research in astrophysics. Kimberly White/Getty Images hide caption

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Kimberly White/Getty Images

How Did A Mistake Unlock One Of Space's Mysteries?

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Tracking A Space Rock's Streak Past Earth

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A meteor's vapor trail above the city of Chelyabinsk, Russia, on Friday. Vyacheslav Nikulin /EPA /LANDOV hide caption

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Vyacheslav Nikulin /EPA /LANDOV

An illustration of what asteroid 2012 DA 14 may look like as it approaches Earth. NASA/JPL-CalTech/EPA /LANDOV hide caption

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NASA/JPL-CalTech/EPA /LANDOV

Nell Greenfieldboyce, for the NPR Newscast

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