Space is stranger than we know.
to change the radiation limits its astronauts can be exposed to to protect their health.
The mutations observed in the blood samples resemble the kind of somatic mutations we see in older individuals — which is interesting on its own, considering the median age of the astronauts was only 42. "The presence of these mutations does not necessarily mean that the astronauts will develop cardiovascular disease or cancer," he added, "but there is the risk that, over time, this could happen through ongoing and prolonged exposure to the extreme environment of deep space."
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