Japanese astronaut Norishige Kanai thought he’d grown a whole 9cm in just three weeks since arriving at the International Space Station.
It sounded amazing with the internet fascinated. Numerous experts started trying to work out how something like this could happen.
There was even concern that he wouldn’t fit in his spacecraft to come back home again.
But instead, it turns out he’d just measured himself wrongly.
He had grown taller, but only by 2cm, which is normal for astronauts.