Warm Up At NASA's Sun-Earth Day Tweetup

NASA is inviting its Twitter followers to a daylong event revolving around the sun and Earth's relationship. NASA will randomly select 100 registrants to participate in the Sun-Earth Day Tweetup March 19 at NASA's Goddard Space Flight Center in Greenbelt, Md. Registration opens at noon EST on Tuesday, Feb. 22, and closes at 5 p.m. on Thursday, Feb. 24. More info.

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