Astronauts are highly trained individuals who travel into space to explore and conduct research. They wear special suits called space suits that protect them from the harsh environment of space, including extreme temperatures and radiation. Astronauts often work on missions aboard spacecraft like the International Space Station (ISS), where they perform experiments and gather important data about our universe. To become an astronaut, candidates must complete rigorous training, which includes learning how to operate spacecraft, conduct spacewalks, and handle emergencies. Many astronauts have backgrounds in science, engineering, or the military. Their work helps us understand more about Earth, other planets, and the possibility of life beyond our planet.