| Light and the EM Spectrum |
speed of light gamma rays x rays ultraviolet visible infrared radio Balmer series hydrogen alpha continuous spectrum emission spectrum absorption spectrum Wien's Law Stefan-Boltzmann Law |
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| The Sun | solar rotation sunspot cycle phototsphere chromosphere corona granule spicule proton-proton chain neutrinos |
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| Stellar Properties | light year parsec apparent magnitude absolute magnitude parallax proper motion O B A F G K M color index |
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| The H-R Diagram | main sequence Red Giants White Dwarfs Red Giants |
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| The Interstellar Medium | 21 cm radiation molecular clouds dust cocoon nebula![]() ![]() |
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| The Birth of Stars | Helmholtz Contraction Hayshi tracks protostars cocoon nebula T Tauri Stars zero age main sequence |
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| Death of Stars | type I supernova type II supernova planetary nebula neutron stars black holes |
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| Binary Star Systems | visual binaries eclipsing binaries astrometric binaries spectroscopic binaries light curves |
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| Star Clusters | open clusters globular clusters |
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| The Milky Way | spiral structure stellar populations |