Expedition 39 commander Koichi Wakata, together with astronauts Rick Mastracchio and Steve Swanson of NASA, sent an Earth Day message from the International Space Station on April 22. As Mastracchio

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Expedition 39 commander Koichi Wakata, together with astronauts Rick Mastracchio and Steve Swanson of NASA, sent an Earth Day message from the International Space Station on April 22. As Mastracchio puts it, astronauts “really get to see and appreciate Earth as our home … a beautiful and dynamic world worth protecting”. Credit: YouTube/NASA

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Tue, Apr 22, 2014 3:33 PM EDT