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"We're looking forward to it," said Jason Townsend, a spokesman at NASA Headquarters in Washington.
He said NASA has selected 20 video questions from the scads that were sent in by the agency's social-media followers, and at least some of those questions will be aired for the space station astronauts to answer during a 20-minute downlink opportunity starting at 11 a.m. ET. "We're angling to fill every minute," Townsend told NBC News.
Three of the space station's six astronauts — station commander Kevin Ford, NASA colleague Tom Marshburn and Canada's Chris Hadfield — will participate in the space-plus-Earth Hangout. (The three others, all Russians, will presumably be minding the store.)
Townsend said that for the balance of the hour, questions will be handled by two NASA astronauts on the ground: Ron Garan, a social-media star who's in nearly 3 million Google+ circles; and Nicole Stott, who participated in the space station's first live NASA Tweetup in 2009.