British-born astronaut Michael Foale has blasted into space to take command of the International Space Station.
Foale is now an American, and after his six-month stay in space he'll be the most experienced US astronaut ever.
He'll be staying on the ISS with Russian cosmonaut Alexander Kaleri, who has been into space three times before.
Their spacecraft lifted off from the Baikonur Cosmodrome in Kazakhstan very early on Saturday morning, and should dock with the ISS on Monday.
Foale blasted into space on a Soyuz rocket
Cosmonaut got married in space
The two men, who make up the Expedition 8 crew, will replace Russian Yuri Malenchenko, 41, and American Ed Lu, who have been living and working in space since April.
Cosmonaut Malenchenko got married in orbit and has not yet had a chance to see the bride face-to-face.
The main purpose of the mission is to exchange crews and to switch over the Soyuz space craft which is kept permanently docked at the ISS, in case of emergencies.
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