A photo released by Virgin Galactic shows a badly injured SpaceShipTwo pilot Peter Siebold drifting under his parachute after last October's accident that destroyed the spacecraft during a test flight. Mark Greenberg/Virgin Galactic hide caption

itoggle caption Mark Greenberg/Virgin Galactic

Star Trek's Mr. Spock and Captain Kirk never even lose pocket change when they use a transporter to get from TV's Starship Enterprise to distant worlds. What gives? Paramount Television/The Kobal Collection hide caption

itoggle caption Paramount Television/The Kobal Collection

Artist's concept compares Earth (left) to the new planet, called Kepler-452b, which is about 60 percent larger in diameter. NASA/JPL-Caltech/T. Pyle hide caption

itoggle caption NASA/JPL-Caltech/T. Pyle

The SpaceX Falcon 9 rocket and Dragon spacecraft break apart shortly after liftoff from the Cape Canaveral Air Force Station in Cape Canaveral, Fla., on June 28. SpaceX CEO Elon Musk said Monday the failure of a steel strut likely caused the rocket to explode. John Raoux/AP hide caption

itoggle caption John Raoux/AP

Members of the New Horizons science team react to seeing the spacecraft's image of Pluto on Tuesday, before its closest approach. Bill Ingalls/NASA via AP hide caption

itoggle caption Bill Ingalls/NASA via AP