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.
The launch, employing the upgraded Block 5 version of the Falcon 9 rocket, remained scheduled for 7:21 p.m.
SpaceX previously accomplished this feat after leaving from Florida but hadn't done so in California or the West Coast until now, Fox News reported.
SpaceX launched and landed the Falcon 9 rocket on Sunday night - making it the first successful landing of an orbital class rocket booster on West Coast land. At the time, the launch was scheduled to occur from the Kwajalein Atoll in the Pacific Ocean where SpaceX launched the now retired Falcon 1. The launch was historic as Space-X brought the lst stage booster back to Vandenberg next to the launch pad the payload has left less than 20 minutes earlier.
By the way: SpaceX would like to land every booster on terra firma, to ease the reflight process.
SpaceX calls its California touchdown site Landing Zone 4, presumably because it's part of Vandenberg's Space Launch Complex 4 (SLC-4).
The Air Force warned area residents to expect unfamiliar sonic booms.
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Local residents may see the first stage of the Falcon 9 returning to Vandenberg AFB, including multiple engine burns associated with the landing.
SpaceX has pioneered the use of reusable rockets to launch satellites into space.
Argentina's satellite will reportedly track natural disasters, crop yields and soil-moisture levels from 385 miles (620km) above the earth.
Those who knew they were watching a satellite launch posted videos they captured of the stunning spectacle, including one taken over the downtown Los Angeles skyline and a timelapse from Kern County.
SAOCOM 1B is planned to launch next year. "Flying both constellations along the same orbit supports a rapid response by providing SAR information in emergency situations".
Its name is short for Satelite Argentino de Observacion Con Microondas.