Data collected from the identical twin astronauts Mark and Scott Kelly show that space travel is even harder on the body than previously thought. According to a new study published in the journal Cell Stem Cell, stem cells age approximately 10 times faster in space than on the ground, a change that may impact natural healing abilities and contribute to chronic disease. The data provides crucial insights about the health risks of spaceflights and may also help researchers better understand the aging process on Earth.
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