After more than a month of delays, a SpaceX Falcon 9 rocket vaulted toward the skies at 8 p.m. ET Sunday with the secretive payload. It launched from Cape Canaveral Air Force Station in Florida.
The space exploration firm, which is headed by Tesla (TSLA) CEO Elon Musk, initially scheduled the Zuma mission last November.
SpaceX gave a couple reasons for the schedule changes. At one point, SpaceX said it delayed the mission for "fairing testing." The fairing is the very top portion of the rocket that houses the payload. "Extreme weather" also slowed down the company's launch preparations.
Last week, SpaceX finally declared that both the rocket and the payload were "healthy" and ready for launch. 
How come "extreme" weather can stop a missile launch.