The acceleration of space exploration, promoted by astronaut recruitment and private space travel, heralds an imminent future where space travel becomes increasingly common. However, numerous questions persist regarding the physical changes that humans undergo in space. The acceleration of space exploration, promoted by astronaut recruitment and private space travel, heralds an imminent future where space travel becomes increasingly common. However, numerous questions persist regarding the physical changes that humans undergo in space. Space Exploration Phys.org – latest science and technology news stories