The twilight launch created a spectacular sight in the night sky for spectators in Southern California, who took to Twitter to share their fantastic photos. "Nope, definitely not aliens", Garcetti wrote.
After it separated from the second stage, the first stage of the Falcon 9 rocket arrested its forward movement, and began falling back toward Earth.
A Falcon 9 rocket with a pre-flown first stage launched from California's Vandenberg Air Force Base tonight (Oct. 7) at 10:21 p.m. EDT (7:21 p.m. local time; 0221 GMT on October 8), successfully delivering Argentina's SAOCOM-1A Earth-observation satellite to orbit.
It's the very first time SpaceX (or anyone) has successfully landed a rocket on the West Coast.
The launch, employing the upgraded Block 5 version of the Falcon 9 rocket, remained scheduled for 7:21 p.m.
SpaceX had previously flown first-stage rockets back to land after Florida launches but had not done so on the West Coast.
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As The Verge noted, SpaceX hasn't been making sea landings by choice.
If anything goes wrong during the launch and landing, there is a risk of explosion.
The satellite is the first of two for Argentina's space agency, Comision Nacional de Actividades Espaciales, and will work in conjunction with a constellation of Italian space agency satellites.
A look at Landing Zone 4, SpaceX's newest rocket landing site, at Vandenberg Air Force Base in California.
Later, SpaceX reported that the SAOCOM 1A radar satellite was placed in its proper pole-to-pole orbit.
The satellite is the first of two that will be used for emergency management and for land monitoring.