SpaceX is planning to launch a Falcon 9 rocket from Vandenberg Space Force Base on Thursday morning.
The rocket is scheduled to launch at 10:39 a.m. on July 21.
If the launch is scrubbed, there's a backup launch opportunity at the same time on Friday, July 22.
The rocket will deliver 46 Starlink satellites into orbit.
Starlink is SpaceX's high-speed broadband satellite internet service designed to reach rural and remote communities.
Following stage separation, SpaceX will aim to land the rocket's first stage booster on the "Of Course I Still Love You" droneship stationed in the Pacific Ocean so it can potentially be used again. The same booster was previously used to launch the NROL-87, NROL-85, and SARah-1 missions.
A live webcast of the launch will begin about five minutes prior to liftoff.