The SpaceX Dragon, selected by NASA to transport astronauts Suni Williams and Butch Wilmore home, arrived Sunday at the International Space Station.

After their weeklong journey turned into a monthslong stay on the International Space Station, two Boeing Starliner astronauts will soon be united with the spacecraft that will eventually bring them home.

Two astronauts relinquished their seats on a four-person spacecraft so that their colleagues could return to Earth from the ISS, where they’ve been stuck since June.