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The Absolute Limit of Human Survival in Space

There's a clock ticking inside every astronaut's body the moment they leave Earth. Scientists have calculated when it runs out. Forget fuel limitations. Forget the distance to Mars. The real barrier to human space exploration is something we carry with us: our own biology. After decades of research, NASA scientists have identified the point where survival transforms into slow deterioration—where the human body simply cannot continue. In this calming long-form space documentary, we explore what space actually does to the human body—and why scientists believe there's a hard limit on how long we can survive out there. From radiation silently shredding our cells to the psychological toll of years-long isolation, this is the story of biology meeting the cosmos. #space #spacedocumentary #mars #astronauts #scienceforsleep #NASA #deepspace