Astronaut Scott Kelly has shrunk back to his normal height after growing by 1.5 inches while on the International Space Station, his identical twin brother has said.
The 52-year-old arrived back in the US on Thursday after spending almost a year in space.
His 340 days aboard the ISS allowed NASA to study the long-term effects of space travel using a comparison between his development and that of his twin brother Mark on Earth.
Astronauts in space typically grow taller because the spine has a chance to stretch with less pressure from gravity.
Once back on Earth, Commander Kelly shrank back to normal within two days.
His growth has been reported as up to two inches, but the astronaut's brother told CNN that the pair stood back-to-back an hour after he returned to the US on Thursday.
A day earlier, Cdr Kelly had touched down in a bitterly cold Kazakhstan along with Russian cosmonauts Mikhail Kornienko and Sergei Volko.
During his year in space, he did everything from science experiments to spacewalks.
He described his time in space as like "camping in the woods". He said it was a "harsh environment" that your body never truly gets used to.
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