- Norishige Kanai was on a mission at the International Space Station
- He went to space last month for a nearly six-month mission
- He apologised on Twitter for exaggerating his height increase in space
Most astronauts "grow" during protracted space missions because their spines extend in the absence of gravity, but the gains are usually limited to a couple of centimeters (inches) maximum and disappear once they are back on the ground.
The 41-year-old Kanai, who went to space last month for a nearly six-month mission, posted on Twitter on Monday that he had "a big announcement."
"My height's been measured here in space and somehow, somehow, I've grown 9 cm! In only three weeks I've really shot up, something I haven't seen since high school," he tweeted.
"This makes me a little worried that I might not be able to fit in the Soyuz seats for our return."
But a bit over a day later - and in the wake of a flurry of news stories - he apologised, saying that he'd measured himself after his captain raised questions about the apparent growth and he had stretched only 2 cm from his Earth-bound height.
"It appears I can fit on the Soyuz, so I'm relieved."
(Reporting by Elaine Lies; Editing by Michael Perry)
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
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