The qualifications you need for jobs differ from job to job. When I applied for my job I had an ordinary bachelors degree in Aircraft Systems and a Masters in Astronautical and Space Engineering. Effectively the only one that really mattered was my Masters since it was directly applicable to the job title. However, I do know people that work there who just have an under graduate degree in a specific field of engineering. It all depends on whats on your CV that impresses them to get your foot in the door and then how they feel about you in an interview. If I were you I would worry more about getting a degree in a field of engineering that you enjoy and then worry about how to get into the space industry after that. Mechanical, Electrical, chemical and software engineering are all applicable. Then there are more specific degrees under that that you could do as well to get in. The opportunities are endless once you apply yourself!