Q&A with Dan Hart, president and CEO of Virgin Orbit (members only)

SpaceX test-fired a reused Falcon 9 booster Monday at NASA’s Kennedy Space Center in Florida, checking the rocket’s readiness for a planned liftoff Saturday with an Airbus-built commercial communications satellite.

A SpaceX Falcon 9 rocket, powered by a previously-flown booster, lifts off from launch pad 39A at NASA’s Kennedy Space Center in Florida at 6:27 p.m. EDT (2227 GMT) on March 30, 2017, carrying the SES 10 communications satellite. The launch marked the first time SpaceX has reused the first stage of one of its Falcon 9 rockets.

A senior NASA official said Tuesday that the Space Launch System, a huge heavy-lift rocket years behind schedule, could launch astronauts on a moon landing mission in 2024 on just its third flight to meet a goal announced last month by Vice President Mike Pence, while commercial companies will be entrusted with more responsibility to develop a lunar lander and a modest mini-space station, or Gateway, in lunar orbit.