Example image of eyePlorer eyePlorer map for 'Stellar classification': Astronomy Spectrum Chromosphere Excited state Ion Star Chemical element Diffraction grating Light Photon Spectral line Roman numerals Sun Sirius Angelo Secchi Altair Hydrogen line Gamma Orionis Rigel Arcturus Capella (star) Antares Betelgeuse Beta Lyrae Carbon Carbon star Gamma Cassiopeiae Kelvin Main sequence Red giant Mnemonic Arabic numerals Balmer series Calcium Hydrogen Orion (constellation) Sodium Edward Charles Pickering Harvard College Observatory Williamina Fleming Stellar classification Antonia Maury Annie Jump Cannon Temperature Meghnad Saha Cecilia Payne-Gaposchkin Kelvin–Helmholtz mechanism Nuclear fusion Gravitation Black body
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