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NASA Administrator Charles Bolden gives keynote address at Spacecom Expo in Houston. Credit: SpaceNews/Jeff Foust
Psyche. Credit: SSL artist's concept.
Orion. Credit: Lockheed Martin artist's concept.
NTSB Acting Chairman Christopher Hart surveys one section of the SpaceShipTwo accident site 
NTSB Acting Chairman Christopher Hart surveys one section of the SpaceShipTwo accident site. Credit: NTSB
UK Space Conference Video 2015
Credit: NTSB
Steve Jurczyk
Astronaut Chris Hadfield — Canada's biggest contribution to the  International Space Station since the Canadarm —shows his colors. Credit: NASA
The International Space Station's robotic Canadarm2 shown moving the HTV-3 Exposed Pallet for installation on JAXA's HTV cargo vehicle. Credit: NASA
NASA's MESSENGER probe orbiting Mercury
Progress 52 docking mechanism
Sentinel Telescope
SERT solar sandwich concept
John Shannon (seated, left) watches the launch of the Space Shuttle Endeavour in March 2008. Credit: NASA/Bill Ingals
Plum Brook Station.

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