pOn Friday, February 1 -- the 10th anniversary of the iColumbia/i accident -- NASA will pay tribute to the crews of strongiApollo 1/i/strong and space shuttles strongiChallenger/i/strong and strongiColumbia/i/strong with ai /istrongDay of Remembrance/strong. Flags across the agency will be flown at half-staff in their memory./pp/ppOn January 27, 1967, Virgil “Gus” Grissom, Edward White and Roger Chaffee were killed in the iApollo 1/i fire during a launch pad test. On Ja.../p

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A United Launch Alliance Atlas V 401 rocket streaks away from Space Launch Complex 41 into the night sky over Cape Canaveral Air Force Station in Florida, carrying NASA's Tracking and Data Relay Satellite-K, TDRS-K, to orbit.The TDRS-K spacecraft is part of the next-generation series in the Tracking and Data Relay Satellite System, a constellation of space-based communication satellites providing tracking, telemetry, command and high-bandwidth data return services.emPhoto credit: NASA/Glenn Benson/em

NASA astronaut Kevin Ford, Expedition 34 commander, watches a water bubble float freely between him and the camera, showing his image refracted, in the Unity node of the International Space Station.emImage Credit: NASA/em