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Two major branches of space science is astronomy and aerospace engineering.

Astronomy[]

  • Astronomy
    • Outline of astronomy
      • Fields of astronomy defined by approach
        • Observational astronomyObservatories 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 our Sun
      • Planetary science – the study of planets, especially those other than Earth
        • Planetary geology
      • Galactic astronomy – the study of our 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

Aerospace engineering[]

  • Aerospace engineering
    • Astronautics
    • Aeronautics
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