Four astronauts will soon launch to the space station — a flight that will kick off a series of events culminating in the long-awaited return of NASA astronauts Suni Williams and Butch Wilmore.

Two NASA astronauts are just days away from returning to Earth after nine months in space. Wednesday evening, NASA astronauts Anne McClain and Nichole Ayers, along with Japan Aerospace Exploration Agency astronaut Takuya Onishi and Russian cosmonaut Kirill Peskov,