Q&A with Dante Lauretta, OSIRIS-REx principal investigator

NASA’s first asteroid-sampling probe, OSIRIS-REx, has been assembled at a Lockheed Martin satellite factory in Colorado and is now being tested to ensure it can withstand the harsh journey to an asteroid and back.

United Launch Alliance teams ran through an 11-hour countdown Friday at Cape Canaveral to rehearse procedures before the first flight of a modified Atlas 5 rocket with Boeing’s Starliner crew capsule Dec. 20.

SpaceX’s second Falcon Heavy, outfitted to produce more thrust than the heavy-lifter’s debut flight last year, was raised vertical at launch pad 39A in Florida on Wednesday ahead of a launch attempt with the Arabsat 6A communications satellite.