US astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko have touched down on Earth after almost a year in space.
Their 340-day mission aboard the International Space Station (ISS) is twice the length of a normal stay.
Their extended tour is part of an effort to study the effects of long-duration spaceflight on the body.
But scientists will gain further insights by comparing Scott Kelly with his Earthbound identical twin, Mark.
A Soyuz capsule carrying Kelly, Kornienko and Russian crew member Sergey Volkov parachuted down on to a steppe in Kazakhstan at 10:26 local time (04:26 GMT).
The mission is a record for the ISS and will give Cmdr Kelly a tally of 520 cumulative days in space, over four flights.
Their extended tour is part of an effort to study the effects of long-duration spaceflight on the body.
But scientists will gain further insights by comparing Scott Kelly with his Earthbound identical twin, Mark.
A Soyuz capsule carrying Kelly, Kornienko and Russian crew member Sergey Volkov parachuted down on to a steppe in Kazakhstan at 10:26 local time (04:26 GMT).
The mission is a record for the ISS and will give Cmdr Kelly a tally of 520 cumulative days in space, over four flights.
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