Last June, two NASA astronauts blasted off for the International Space Station (ISS). Butch Wilmore and Suni Williams were supposed to stay for a week. Instead, they were there for nine months.

Why so long? They were taking a new spacecraft for a test drive. But it developed leaks after the launch. So NASA decided it was safer to send the rocket home without a crew.

They splashed down on March 18, after 286 days orbiting Earth.