- Astronomy, Observations and Techniques 11
- Astrophysics and Astroparticles 10
- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) 7
- Classical and Quantum Gravitation, Relativity Theory 5
- Astrobiology 4
- Cosmology 4
- Atomic/Molecular Structure and Spectra 2
- Particle Acceleration and Detection, Beam Physics 2