Many people pulled their cars over to take photos and videos of the sight.
The Los Angeles Fire Department sought to quell any fears among Southern California residents with a statement saying that a "mysterious light in the sky is reported to be as a result of Vandenburg Air Force Base launching [a] rocket to put satellite into space" in Lompoc, California.
Camera-wielding witnesses snapped photos and quickly posted them on social media, with many wondering if it was a UFO. It carried the latest batch of satellites for Iridium Communications. When one Twitter user mentioned Friday night that the rocket launch sparked an "alien debate" among his family members, Musk weighed into the dispute. SpaceX had begun tweeting about the launch from around 5.00 pm PT, according to USAToday, and the launch itself was live streamed on SpaceX's website. Friday's launch was the fourth set of 10 launched by SpaceX, which is scheduled to launch 75 of the 81 in the NEXT system.
A SpaceX rocket lit up the sky in California yesterday evening, leaving some locals puzzled.More news: Canada's move as U.S. confirms hefty Bombardier trade duties
"Outstanding! 40 in orbit in 2017!" said Insprucker.
Iridium is the only mobile voice and data satellite communications network that spans the entire globe, including across oceans, airways and polar regions.
The launch was also the fifth time a Falcon 9 rocket flew with a previously used first stage booster.