Watch live as Elon Musk unveils his vision for missions to Mars

After several delays to wait for improved weather, SpaceX sent a Falcon 9 rocket into space Saturday from California’s Central Coast with 51 small satellites, payloads, and orbital transfer vehicles from customers around the world.

The human-rated Crew Dragon spacecraft being developed by SpaceX will return to Earth under parachutes for splashdowns in ocean, and not execute helicopter-like propulsive touchdowns on land, a SpaceX official confirmed Monday.

Spare parts warehoused in the the United States and Russia will help Boeing finish assembly of a third space station docking port to receive arriving astronauts aboard Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon capsules, replacing a unit lost in a Falcon 9 launch failure last year.