Astronomy & Cosmology

Astronomical Methods How we are to do astronomy: skygazing, telescopic observation, data processing - etc.	Cosmology What is the universe itself?	Astrobiology Astronomical methods of detecting and observing alien life
Galaxies Large gravitationally bound collections of celestial objects	Stars Luminant celestial objects powered by gravitational collapse or induced methods like fusion	Planets Large rounded objects which are neither stars nor remnants.
Space and Media Empty space and the inter-object media which fills the heavens.	Orbits On the mechanics of paths that objects follow in curved spacetime.	Elements and Ephemerides Collated data of celestial objects' properties and orbital properties.
General Astronomy & Cosmology Miscellaneous/general articles on astronomy and cosmology.