The four newcomers — representing the U.S., Japan and Russia — will spend the next few days learning the station’s ins and outs from Butch Wilmore and Suni Williams. Then the two will strap into their own SpaceX capsule later this week to close out an unexpected extended mission that began last June.

SpaceX's Crew-10 astronaut mission will arrive at the International Space Station tonight (March 15), and you can watch the action live.

Reaching orbit from NASA’s Kennedy Space Center, the newest crew includes NASA’s Anne McClain and Nichole Ayers, both military pilots; and Japan’s Takuya Onishi and Russia’s Kirill Peskov, both former airline pilots. They will spend the next six months at the space station, considered the normal stint, after springing Wilmore and Williams free.

NASA astronauts Sunita Williams, Nick Hague, Barry Wilmore, and Donald Pettit unbox Thanksgiving meals, from the International Space Station (ISS), in this screen grab taken from a handout video, released on November 26,

A launch pad problem has forced a flight delay to replace NASA's two stuck astronauts. The new crew needs to get to the International Space Station before Butch Wilmore and Suni Williams can head home after nine months in orbit.

The Starliner saga is a step closer to its end with the launch of a SpaceX vehicle that will relieve the astronauts who flew on the Boeing spacecraft.

NASA will livestream the launch Friday night of Crew-10, which will in part replace the Starliner astronauts at the International Space Station.