Exercise in space keeps astronauts from fainting when they return to Earth, study says | CNN

The lack of gravity astronauts encounter during spaceflight makes returning to the force of Earth’s gravity a little disorienting. And when they return to Earth, they faint.分類：aviation and aerospace industry, business and industry sectors, business, economy and trade, cardiovascular disease, celestial bodies and objects, diseases and disorders, earth, health and medical, hypertension, planets and moons, space and astronomy, space exploration, space industry, spacecraft and satellites...