Watch a 4K video replay of Falcon Heavy’s static fire test (members only)

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.

SpaceX’s first launch of 2018 blasted off at 8 p.m. EST Sunday (0100 GMT Monday). A Falcon 9 rocket took off from Cape Canaveral with a mysterious U.S. government payload known as Zuma, and the first stage returned to landing on Florida’s Space Coast around eight minutes later.

Four satellites set to join O3b’s expanding broadband network successfully launched Friday on top of a Russian-built Soyuz booster from French Guiana, joining 12 other craft linking developing nations, far-flung islands, cruise ships and other hard-to-reach locales with the Internet.