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NASA's Twin Study Reveals Lasting Space Effects on Genes

2/16/2025

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Summary

Story summary

NASA's groundbreaking Twin Study, featuring identical twins Scott and Mark Kelly, unveiled the profound effects of space on the human body. After a year aboard the International Space Station, Scott experienced notable shifts in body mass, gene expression, and hydration. While most changes reversed after his return, 7% of gene alterations lingered, paving the way for enhanced astronaut safety in future missions.

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Story summary

NASA's groundbreaking Twin Study, featuring identical twins Scott and Mark Kelly, unveiled the profound effects of space on the human body. After a year aboard the International Space Station, Scott experienced notable shifts in body mass, gene expression, and hydration. While most changes reversed after his return, 7% of gene alterations lingered, paving the way for enhanced astronaut safety in future missions.