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The human body has evolved, for hundreds of thousands of years, to thrive on the surface of the Earth.

But what happens when you take such an earthbound body and put it in the weightlessness of space?

Things get weird.

Astronauts commonly report diminished eyesight upon their return home, possibly because the eyeball changes shape in space and tissues surrounding the optic nerves become swollen. Without the constant tug of gravity, bones become more brittle and muscles atrophy.

…continue reading ‘Scientists Are Grappling With Our Biggest Limitation in Spaceflight’

See also: Health Standards for Long Duration and Exploration Spaceflight Ethics Principles, Responsibilities, and Decision Framework (2014) – committee chaired by our Jeffrey Kahn

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