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NASA’s Global Hawk unmanned airborne system (UAS).  Image courtesy of NASA's Dryden Flight Research Center.

NASA’s Global Hawk unmanned airborne system (UAS). Image courtesy of NASA's Dryden Flight Research Center.

NASA’s Global Hawk unmanned airborne system (UAS).  Image courtesy of NASA's Dryden Flight Research Center.

NASA’s Global Hawk unmanned airborne system (UAS). Image courtesy of NASA's Dryden Flight Research Center.

Twitter / NASA360: @Debbie Knight Aceves Happy Valentine's from Mars!

Twitter / NASA360: @Debbie Knight Aceves Happy Valentine's from Mars!

Twitter / NASA360: @Debbie Knight Aceves Happy Valentine's from Mars!

Twitter / NASA360: @Debbie Knight Aceves Happy Valentine's from Mars!

NASA ECHO II S-131 // From Wikipedia: "Project Echo was the first passive communications satellite experiment. Each of the two American spacecraft, launched in 1960 and 1964, was a metalized balloon satellite acting as a passive reflector of microwave signals. Communication signals were bounced off of them from one point on Earth to another."

NASA ECHO II S-131 // From Wikipedia: "Project Echo was the first passive communications satellite experiment. Each of the two American spacecraft, launched in 1960 and 1964, was a metalized balloon satellite acting as a passive reflector of microwave signals. Communication signals were bounced off of them from one point on Earth to another."

NASA's Asteroid Redirect Mission will test new capabilities needed to send humans to Mars. A new blog explains - via NASA's photo on Google+

NASA's Asteroid Redirect Mission will test new capabilities needed to send humans to Mars. A new blog explains - via NASA's photo on Google+

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