The Zuma mission is a mystery, but it has been identified as a government payload managed by Northrop Grumman, according to Florida Today. The two-hour launch window begins at 8 p.m.
SpaceX will attempt to launch a Falcon 9 rocket from Cape Canaveral Air Force Station tonight.
It's still unclear where the Zuma mission will be heading.
Nothing is really known about Zuma other than that it was commissioned by Northrop Grumman for an unknown customer and that it's "targeting an insertion position somewhere in low Earth orbit", per TechCrunch.
Skies were clear enough for viewers on the Space Coast to see the rocket's two stages separate, briefly producing a sort of laser light show in the clouds, then follow the first stage as it flew back to Landing Zone 1.
Zuma could be a military satellite, an intelligence and reconnaissance satellite, or something unique and experimental.
The company's first successful Falcon 9 rocket launch of 2018 was also probably the most secretive in the company's history.
The launch was initially supposed to take place in November but was postponed so the California-based company could take a closer look at potential problems with the fairing, or the nose cone part of the rocket that protects the payload. The reusable rocket landed about seven minutes after liftoff, SpaceX said.
The Falcon 9 lifted off at 8 p.m. EST (0100 GMT on January 9) from Cape Canaveral Air Force Station, on Florida's Space Coast. The Wing could potentially support more than 30 launches.