The four U.S., Russian and Japanese astronauts pulled up in their SpaceX capsule after launching from NASA's Kennedy Space Center in Florida. They will spend at least six months at the orbiting lab, swapping places with colleagues up there since March. SpaceX will bring those four back as early as Wednesday.

On May 27, the ninth test lifted off at Vandenberg Space Force Base in California. While the vehicle successfully reached the Earth's orbit, an apparent propellant leak caused a loss of altitude. According to ABC News, the spacecraft began spinning and mission control could no longer control it.

SpaceX's Crew completes the International Space Station mission in 15 hours, carrying astronauts from the US, Japan, and Russia.