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Wikipedia:Dewey Decimal System/520
Dewey Decimal System
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5 Natural Sciences and Mathematics
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52 Astronomy and Allied Sciences
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520 Astronomy and Allied Sciences
Astrometry
Astronomy
Astronomy and astrophysics
Astronomy and Astrophysics basic topics
Astrophysics
Big Bang
Big bang nucleosynthesis
Cosmic microwave background radiation
Cosmic rays
Earth
Electromagnetic radiation
Electromagnetic spectrum
Extragalactic astronomy
Galactic astronomy
Galaxy
Galaxy formation
History of astronomy
Hubble's law
Nebula
Nova
Optical astronomy
Planet
Radio astronomy
Space observatory
Solar system
Star
Star cluster
Star formation
Stellar astronomy
Stellar evolution
Telescope
Wavelength
X-ray astronomy
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