Gallery: Antares rocket explodes

Space station astronaut Reid Wiseman, preparing to return to Earth this weekend after 165 days in orbit, said commercial spaceflight represents the “next breakthrough” in aerospace technology, and that he hopes Virgin Galactic can ultimately turn that dream into reality despite the fatal crash of the company’s SpaceShipTwo rocket plane.

NASA has signed a $187 million contract with Northrop Grumman to complete the preliminary design of a pressurized crew habitat for the planned Gateway mini-space station near the moon, and agency officials have discussed new details about plans to launch first two Gateway modules on a single heavy-lift rocket.

Frank Culbertson, a former shuttle and station astronaut and now head of Orbital ATK’s space systems group, spoke with Spaceflight Now’s Stephen Clark on the sidelines of the 2015 International Symposium for Personal and Commercial Spaceflight.