Tap the phrase that "it" refers to. but pillownauts take lying in bed to another level. In order to help NASA researchers understand what happens to the human body when it leaves Earth pillownauts willingly take part in studies, despite the discomfort and changes to
their bodies that they will experience. They know their work will one day help astronauts travel as far as Mars. Thanks to the information collected in the study of
pillownauts, the agency has solved some of the negative effects of weightlessness on bodies. NASA installed exercise equipment on the International Space Station
Astronauts now perform a two-hour daily workout routine. Astronauts also wear compression socks sleeves, and suits. This clothing imitates gravity's pressure on their bodies. Finally, astronauts sleep upright strapped in a
vertical bed bag which allows blood to pool in the legs. relieving head pressure and preventing headaches. This
makes it a very welcome item on the space station
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