Watch replay of Falcon 9 launch as seen from the press site

A SpaceX Falcon 9 rocket was raised vertical at Space Launch Complex 4-East at Vandenberg Air Force Base in California on Sunday ahead of a planned liftoff with Argentina’s SAOCOM 1A radar observation satellite, and the first landing of a SpaceX booster on the U.S. West Coast.

SpaceX has postponed the launch of its next Falcon 9 rocket indefinitely. The rocket was originally scheduled take off Wednesday from pad 39A at NASA’s Kennedy Space Center in Florida with a top secret U.S. government payload named Zuma. A few minutes after launch, the Falcon 9’s first stage will return for a landing at nearby Cape Canaveral Air Force Station.

Two astronauts floated outside the International Space Station early Friday for the first of four planned spacewalks to wrap up a complex multi-year job to replace 48 aging batteries in the lab’s solar power system with 24 more powerful lithium-ion units.