Can humans become a multi-planet species?
NASA astrobiologist Chris McKay studies the most extreme parts of Earth to understand how life might survive in other perts of the universe. But he's also studying another life form living in space: humans.
AIR DATE 12/4/14
PBS NewsHour provides in-depth analysis of current events with a news summary, live studio interviews and discussions of domestic and international issues. Amna Nawaz and Geoff Bennett co-anchor.
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