Astronauts’ skin gets thinner in space, scientists say

A long-awaited human mission to the Red Planet is still a number of years away, with NASA planning their first manned voyage in the 2030s. But at more than 55 million kilometers away, astronauts face at least half a year of space travel just to get to Mars — not to mention the return journey. Of the multitude of obstacles to overcome, the health of the astronauts during such a long period in space is of chief concern.

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