Before you ever set foot on a spacecraft bound for deep space, tiny replicas of your organs might make the journey first. Suspended in microgravity aboard a research mission, this organ-on-a-chip, or ...
The satellite, launched 14 years ago, will make an uncontrolled re-entry Tuesday evening. NASA puts the risk of harm to anyone on Earth at "approximately 1 in 4,200." ...
Add Yahoo as a preferred source to see more of our stories on Google. Exposure to cosmic radiation varies with altitude—higher altitude means greater exposure. Photograph by JSC/NASA When we gaze up ...
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