Boeing's Starliner spacecraft has landed back on Earth without any astronauts on board, who are currently staying at the International Space Station (ISS). This followed the end of Boeing's first astronaut mission, which concluded with an empty capsule landing on Friday night. The two test pilots who participated in the mission were left behind on the ISS and will remain there until next year. The mission, which was intended as a test, did not go entirely according to plan, earning the Starliner the moniker "Calamity Capsule" in some reports.