The crew-swap mission will enable NASA’s Butch Wilmore and Suni Williams to return to Earth from the International Space Station.

A SpaceX Dragon spacecraft arrived at the International Space Station at 10:35 p.m. Pacific time, paving the way for Suni Williams and Butch Wilmore -- two NASA astronauts who have remained in space for months longer than planned -- to finally return home.

Suni Williams and Butch Wilmore were only supposed to be in space for about a week when they launched in June, but problems with their Boeing Starliner spacecraft extended their journey for months.