Have Blood, Will Travel NASA Science

The radiation astronauts encounter in deep space could put vital blood-making cells in jeopardy. Editor’s Note: Stem cells discussed in this story are adult stem cells, not to be confused with controversial embryonic stem cells. All adults have stem cells; they’re crucial to everyday health. NASA is working to learn how space radiation might affect the blood-making stem cells of astronauts en route to the Moon or Mars.

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