Aerospace Technology and Astronautics Aerospace engineering Astrometry Astronautics Astronomy, Observations and Techniques Astronomy—Observations Classical and Quantum Gravitation, Relativity Theory General relativity (Physics) Geodesy Geophysics Geophysics/Geodesy Gravitation Measurement Science and Instrumentation Measurement    Mechanics, Celestial Observations, Astronomical Physical measurements Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) Space sciences