Astronauts suffer from bone loss for decades from months in space, a study shows

Astronauts on space missions longer than six months suffer from decades of bone loss, much of which may be irreversible, a new study has found. The finding could pose a serious challenge to future human missions to Mars.

On missions lasting six months or more, astronauts’ exposure to the microgravity of space causes them to experience bone loss equivalent to two decades of aging. And only half of the bone lost recovers back on Earth after a year, leaving her bone structure a decade old, researchers wrote in a study published June 30 in the journal Scientific Reports (opens in new tab).

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