Satellites are also used to look at and land on other planets such as Mars and Venus To become involved in studying the images satellites return you should think about taking a relevant degree such as Earth Sciences in which you'll study about the Earth and how its oceans, atmosphere, volcanoes and continents work. Further study, such as a remote sensing course, will help you squeeze all the information you can from these images. A degree in physics, maths or engineering is a must if you want to build satellites. The chances are that some of the youngest of you reading this will see an increase in astronaut vacancies in the next century. Well you'll need a very good background in science in particular physics, maths, chemistry and biology.
Earth sciences can be useful too.
Astronauts have to be fit, fast thinking and be able to work well in a team. A degree is a must and most astronauts have undertaken a number of years of further study to become experts in their science subjects.