SpaceX launched of a Falcon 9 rocket at 6:01 a.m. EDT (1001 GMT) Sunday with the company’s next 60 Starlink internet satellites. The Falcon 9’s reusable first stage, making its ninth flight to space, successfully landed on a drone ship positioned offshore in the Atlantic Ocean.

The ISS Deorbit Vehicle, or DV, will be a custom-built, one-of-a-kind spacecraft needed to make sure the space station re-enters the atmosphere at the precise place and in the proper orientation to insure any wreckage that survives the 3,000-degree heat of re-entry will crash harmlessly into the sea.

The Falcon 9 booster for SpaceX’s next mission fired up briefly on a Cape Canaveral launch pad Sunday in a routine pre-flight test before a scheduled launch Friday night to kick off the final flight of the first version of the company’s Dragon cargo capsule to the International Space Station.