How to be a Space Scientist Broadly, there are four major career streams: 1.Traditional astronomy, which is the study of stars, planets, galaxies, etc. 2.Astronautics, which is about designing the next generation of spaceships, understanding space environment, space food, and designing spacesuits. 3.Astrophysics, which involves studying the physics of space and the universe, such as density, radiation, chemical composition, mechanics, and thermal properties of stars, galaxies, space, and planets. 3.Finally, you can choose to be a person who actually goes into space- an astronaut. Astronauts are scientists who deal with experiments in space, or repair of space equipment and stations. If you want to be considered a potential spacewalker, you must maintain excellent health. So it is important to stay fit and focused. You have to excel in maths and science including physics. ...