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.
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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.
