Early this morning, Mars had its closest encounter with Earth in 60,000 years, giving observers the best view of the red planet in their lifetimes. Terence Smith discusses the event with astrophysicist Neil DeGrasse Tyson.

With the release of a report Tuesday detailing the findings of an independent board's investigation into the Feb. 1 breakup of the space shuttle Columbia, experts discuss reaction to the report and what its recommendations may mean for NASA's future.

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