Long mission begins for astronaut and two cosmonauts on ISS

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It is the start of a long mission in space for a US astronaut and two Russian cosmonauts.

The three men blasted off in a Russian Soyuz rocket from the Baikonur Cosmodrome in Kazakhstan on Friday.

Their mission is on the International Space Station, where two of the men will stay for a year.

This is twice as long as previous crews.

The mission is a chance for scientists to see how humans cope in space for so long.

This is particularly important for any future planning of multi-year missions to Mars.