Video: Liftoff of Atlas 5 on space station cargo mission

A commercial Dragon cargo capsule is heading back to Earth Tuesday to conclude a 31-day stay at the International Space Station. The SpaceX-owned spacecraft was released from the station’s Canadian-built robotic arm at 10:59 a.m. EDT (1459 GMT), and the Dragon supply ship splashed down in the Pacific Ocean with nearly 3,400 pounds of cargo at 4:21 p.m. EDT (2021 GMT).

SpaceX test-fired nine Merlin engines Saturday before the company’s next launch from Cape Canaveral, clearing a key readiness test before liftoff as soon as Sunday night with 60 more Starlink internet satellites.

The four RS-25 engines at the bottom of NASA’s first Space Launch System core stage shut down about a minute into a ground test-firing Saturday that was supposed to last more than eight minutes.