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ISS: Japanese astronaut Norishige Kanai worried by growth spurt

From BBC - January 9, 2018

A Japanese astronaut who is living on the International Space Station says he has grown 9cm (3.5in) since arriving there just over three weeks ago.

Norishige Kanai wrote on social media he was worried he would not fit into the seat of the Russian Soyuz vehicle that is due to bring him home in June.

Astronauts grow an average of between two and five centimetres in space.

This is because of the absence of gravity which allows the vertebrae in their spines to spread apart.

Mr Kanai tweeted: "Good morning, everybody. I have a major announcement today. We had our bodies measured after reaching space, and wow, wow, wow, I had actually grown by as much as 9cm!

"I grew like some plant in just three weeks. Nothing like this since high school. I am a bit worried whether I will fit in the Soyuz seat when I go back."

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