What term describes a person trained for traveling in space?

The term that describes a person trained for traveling in space is "astronaut." Astronauts undergo extensive training in various areas, including piloting spacecraft, conducting scientific research, and performing extravehicular activities (spacewalks). This specialized training is essential for ensuring their safety and effectiveness in the challenging environment of space. They often work in teams to conduct missions that can involve complex tasks such as repairing equipment, conducting experiments, and exploring other celestial bodies. While scientists, engineers, and astrophysicists may also be involved in space missions, they usually focus on research, design, or theoretical aspects rather than traveling to space themselves. Thus, "astronaut" is the most accurate term for someone specifically trained for space travel.