Astronauts are highly trained individuals who travel into space to conduct research and perform various tasks aboard spacecraft. They undergo rigorous training in areas such as science, engineering, and physical fitness to prepare for the challenges of space travel. Astronauts often work on missions for organizations like NASA or ESA. During their missions, astronauts may conduct experiments, repair equipment, or participate in spacewalks. They live and work in microgravity, which allows them to study the effects of space on the human body and test new technologies. Their work contributes to our understanding of space and supports future exploration efforts.