NASA, JAXA, and Roscosmos astronauts join the ISS after a successful SpaceX Dragon mission, welcomed by Expedition 72 crew.

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.

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 two astronauts who crewed the Boeing Starliner greeted their replacements, who docked at the International Space Station.

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,

The delayed mission has reached the space station, the hatch has opened and soon the two astronauts who've been "stuck" in space can return home.

The four newcomers — representing the U.S., Japan and Russia — will spend the next few days learning the station's ins and outs.