VIDEO: burning of the skin and more ... compared to 340 days in space

Scott Kelly is in the US to spend back after on board the International Space Station in space 340 days.

It is the longest a US astronaut has gone in the space of a single trip.

With his teammates, he was involved in more than 450 experiments on board.

Life in zero gravity meant its size by 3.8 cm increased, but has returned to its normal size to Earth.

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