The primary goal of Sunday's mission was to place the SAOCOM 1A satellite into orbit, but SpaceX also successfully sent a first stage booster back to the base for the first time.
The booster put on a spectacular show as it descended tail first toward Landing Zone 4 just a few hundred yards from the rocket's launch stand, deploying four legs and firing up one of its nine Merlin engines, seemingly at the last moment, to slow down for touchdown in a cloud of fiery exhaust.
Below are some photos we were sent by viewers Sunday night.
Lighting up the early evening sky, a SpaceX Falcon 9 rocket streaked away Sunday from California, boosting an Argentine environmental satellite into orbit.
Minutes after launch, the rocket's second stage separated from the first-stage booster and continued rising spaceward.
Elon Musk put it a little more bluntly: "This won't be subtle", he wrote on Twitter.
A SpaceX Falcon 9 rocket carrying an Argentinian satellite has blasted off from California. It will mark the first time the innovative company has attempted a ground landing at Vandenberg.
EPL: man city missed out on a victory over Liverpool
It's the last weekend of Premier League action before the worldwide break, and there are some appetising fixtures on the menu. Liverpool roared out of the traps in typically high-octane style with Mohamed Salah fizzing just wide.
Carolina Panthers Announce That Eric Reid Will Start on Sunday
The Saints used a new wrinkle last weekend against the Giants, having backup quarterback Taysom Hill rush four times for 28 yards. At the quarter mark of the season, the Giants rank 25th in offense and 11th in defense in terms of yards.
At least 11 dead in Haiti earthquake: govt spokesman
Officials reported that people had been injured, but had not confirmed local media reports of deaths. The devastating 7.0-magnitude quake in January 2010 left more than 1.5 people homeless.
If anything goes wrong during the launch and landing, there is a risk of explosion.
A graphic explaining sonic booms, provided by Vandenberg Air Force Base ahead of a planned SpaceX launch on October 7, 2018.
The satellite will be operated by Argentina's space agency, known as the National Commission on Space Activites or by its Spanish-language acronym, CONAE. It carries a high-resolution instrument called a synthetic aperature radar that will be used for emergency management and land monitoring.
SAOCOM-1A's radar measurements will track soil-moisture levels, thereby aiding forecasts of crop yields.
"SAOCOM" is short for "Satélite Argentino de Observación Con Microondas", which is Spanish for "Argentine Microwave-Observation Satellite".
The satellite's twin, SAOCOM-1B, will also launch on a Falcon 9; its liftoff is targeted for next year.