DLR is the German Aerospace Centre. It has 31 institutes spread over 8 sites with 5100 employees, 2300 scientists, about 500 doctoral students and junior scientists and 100 visiting scientists. The DLR budget for in-house research and development work and other internal operations amounts to approximately €450 million, of which one-third comes from revenues earned by DLR. DLR also administers the space budget of the German government, with about €750 million. Key areas are Aeronautics, Space, Transportation and Energy.