Two astronauts are one step closer to returning to Earth. A SpaceX Dragon carrying a crew of four will dock at the International Space Station later tonight. The crew will replace Butch Wilmore and Suni Williams, who have been in space for more than nine months.

NASA stated that if weather permits, the SpaceX capsule carrying Wilmore, Williams and two other astronauts will undock from the space station early Tuesday and splash down off Florida's coast later that evening.