Dec. 20, 2012 • NASA will host a two-day event for 80 of its social media followers on Sunday, Feb. 10 and Monday, Feb. 11 at Vandenberg Air Force Base in Lompoc, Calif., for the launch of the Landsat Data Continuity Mission. Registration is open from Dec. 20–Jan. 7.
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The world has lost 561 square miles (1,453 square kilometers) of salt marshes over the past 20 years.