"We're all very excited".
Arizonans, and presumably Americans all over the country were collectively confused and maybe a little scared when a giant light appeared in the sky on Sunday night.
Los Angeles Mayor Eric Garcetti was among those trying to clear up the speculation, tweeting a photo of the launch and writing: "Nope, definitely not aliens".
The rocket launched the SAOCOM 1A satellite into orbit and then the rocket landed back on the west coast.
The Air Force said before the 7:22 p.m. launch that it expected that people as far away as Sacramento and Southern California would see the rocket's contrail.
A handsome sky show following Falcon 9's launch. SpaceX completed the secondary mission of landing the first stage of the Falcon 9 rocket at Landing Zone 4, which was previously called SLC-4W, at Vandenberg Air Force Base.
By the way: SpaceX would like to land every booster on terra firma, to ease the reflight process. Elon Musk's company had leased a former Titan rocket launch site in 2015 to build its own landing pad, but it it hasn't received clearance. Prior landings have taken place on the East Coast. This was SpaceX's first land landing attempt at Vandenberg Air Force Base. This mission has the main aim to gather soil moisture information.
About three minutes after launch, the rocket detached from the "second stage", including the satellite, stopped its forward momentum, and began to fall back toward the earth, according to SpaceX. Both spacecraft will make similar observations from orbit, which will be integrated with measurements made by a network of Italian satellites. The Associated Press reports that it was carrying an Argentinian satellite into space.