Q&A with Keith Gendreau, principal investigator of the first X-ray space communications experiment (members only)

A decade in the making, the core stage for NASA’s first Space Launch System heavy-lift rocket rolled into the Vehicle Assembly Building at the Kennedy Space Center Thursday to join up with twin solid rocket boosters and an Orion capsule for an unpiloted test flight around the moon.

SpaceX’s first upgraded Falcon 9 “Block 5” rocket was raised vertical at launch pad 39A early Thursday in preparation for liftoff from the Kennedy Space Center, debuting enhancements aimed at making the booster more reusable and more reliable.

Astronaut Scott Kelly, in good spirits and looking surprisingly fit after a record 340 days in space, said Wednesday he could have stayed up longer if necessary, giving him confidence future astronauts will be up to the challenge of even longer flights to Mars and beyond.