NASA - National Aeronautics and Space Administration

NASA astronauts recently got another opportunity to climb inside SpaceX's Dragon spacecraft, which they could one day fly to the International Space Station for the agency's Commercial Crew Program.

The Boeing Company successfully completed the second parachute drop test for its CST-100 spacecraft, which it is developing in partnership with NASA's Commercial Crew Program.

Program Manager Ed Mango answers a number of questions from around the world during a live Tweet Chat on April 27.