The first American commercially built-and-operated crew spacecraft in eight years docked successfully Sunday at the International Space Station.

There was, however, no crew aboard the spacecraft, just a test dummy named Ripley, in a nod to the lead character in the Alien movies.

The docking was carried out autonomously by the Crew Dragon capsule, as the three astronauts on board the International Space Station watched. The Space X Crew Dragon capsule lifted off atop a Falcon 9 rocket early Saturday from Florida's Kennedy Space Center.

