As the afternoon breezes blow harder in the Atacama Desert—a place so desolate it’s used as a model of Mars—more microbes move into its driest regions.
Scott Kelly’s physiology, gene activity, and mental performance changed after time aboard the International Space Station, but mostly returned to normal once back on Earth.
By simulating the structure and composition of Mars’s rocky materials, scientists observe how the metal-eating, extreme environment–inhabiting microbe Metallosphaera sedula could alter extraterrestrial environments.