Space science encompasses all of the scientific disciplines that involve space exploration and study natural phenomena and physical bodies occurring in outer space, such as space medicine and astrobiology.
Astronomy
Outline of astronomy
Fields of astronomy defined by approach
Observational astronomy – Observatories on the ground as well as space observatories take measurements of celestial entities and phenomena
Astrometry – studies the position and movements of celestial objects
Amateur astronomy
Theoretical astronomy – mathematical modelling of celestial entities and phenomena
Fields of astronomy defined by scope
Astrophysics – study of the physics of the universe; of extraterrestrial objects and interstitial spaces
Space plasma physics
Orbital mechanics or astrodynamics, which also has applications to spacecraft
Stellar astronomy – the study of stars
Solar astronomy – the study of the Sun
Planetary science – the study of planets, especially those other than Earth
Planetary geology
Galactic astronomy – the study of the Milky Way galaxy
Extragalactic astronomy – the study of the larger universe beyond the Milky Way
Physical cosmology – the study of the Universe as a whole