- Astronomy, Observations and Techniques 90
- Astronomy, Astrophysics and Cosmology 47
- Astrophysics and Astroparticles 40
- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) 29
- Geophysics/Geodesy 3
- Planetology 3
- Astrobiology 1
- Cosmology 1
- Particle and Nuclear Physics 1
- Surfaces and Interfaces, Thin Films 1