From Space.com:
“A tiny, eight-legged critter that can suspend all biological activity in extreme environments survived a journey to space that would have instantly killed any human and most other life forms.
In the first test of its kind, researchers exposed the hardy segmented creatures, called “water bears,” to the open and harsh vacuum of space, with all its deadly radiation, on a spacecraft in low-Earth orbit. Many of them survived. The water bears are less than 1.5 millimeters long. They live on wet lichens and mosses, but when their environment dries out, they just wait for a return of water. They also resist heat, cold and radiation.”
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