https://en.m.wikipedia.org/w/index.php?title=Shape_of_the_universe
Minor Planet Center (MPC) is the single worldwide location for receipt and distribution of positional measurements of minor planets, comets and outer irregular natural satellites of the major planets
https://pds.nasa.gov/
https://ntrs.nasa.gov/
https://catalog.data.gov/dataset/?publisher=National+Aeronautics+and+Space+Administration
More generally, astronomy studies everything that originates beyond Earth's atmosphere.
https://en.m.wikipedia.org/wiki/Oh-My-God_particle
Meteorite classification
https://en.m.wikipedia.org/w/index.php?title=Meteorite_classification&diffonly=true
Asteroid spectral types
https://en.m.wikipedia.org/wiki/Asteroid_spectral_types
Category:Asteroid spectral classes
https://en.m.wikipedia.org/wiki/Category:Asteroid_spectral_classes
Stellar classification
https://en.m.wikipedia.org/w/index.php?title=Stellar_classification&diffonly=true#Luminosity_class
https://en.m.wikipedia.org/wiki/Cosmochemistry
https://en.m.wikipedia.org/w/index.php?title=List_of_interstellar_and_circumstellar_molecules&diffonly=true
Atomic and molecular astrophysics
https://en.m.wikipedia.org/w/index.php?title=Atomic_and_molecular_astrophysics&diffonly=true
Celestial sphere
https://en.m.wikipedia.org/wiki/Celestial_sphere
Astronomical coordinate systems
https://en.m.wikipedia.org/w/index.php?title=Astronomical_coordinate_systems&diffonly=true
International Celestial Reference System and its realizations
https://en.m.wikipedia.org/w/index.php?title=International_Celestial_Reference_System_and_its_realizations&diffonly=true