SpaceX is scheduled to launch one of its reusable rockets Friday night from Vandenberg Space Force Base, with the 17-minute launch window opening at 11:39 p.m.
If needed, a backup window will begin Saturday night at the same time.
The mission will mark the 13th flight of the rocket’s first-stage booster and deliver 74 satellite payloads into orbit, “including cubesats, microsats, hosted payloads, and a re-entry capsule,” SpaceX said.