NASA astronauts Barry 'Butch' Wilmore and Sunita Williams - whose stay seems to be extended far beyond what was actually planned - seem to be facing 'life-altering' risks while remaining stranded on the International Space Station (ISS) till 2025, as per the experts.

NASA astronauts facing 'life-altering' risks in space. Here's what can happen to them if they remain stranded

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NASA astronauts facing 'life-altering' risks in space. Here's what can happen to them if they remain stranded