Sort Stars Into Stellar Classifications (6 Questions)

Sort Stars Into Stellar Classifications

Stars are classified by astronomers using the Morgan-Keenan spectral classification system, which groups stars by their temperature, color, and luminosity. The main sequence classes from hottest to coolest are O, B, A, F, G, K, and M - Remembered by the mnemonic 'Oh Be A Fine Girl, Kiss Me.' Our Sun is a G-type main-sequence star. O and B stars are hot, blue, and massive but short-lived. K and M stars are cooler red stars that are incredibly long-lived and abundant. Beyond main sequence, there are giant and supergiant classes. In this sortable quiz, you'll classify famous stars and star types into their correct stellar classification categories.

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Sortable 11 plays 6 questions ~1 min

Stellar classification sorts stars by temperature and spectral characteristics. O and B-type stars are hot blue giants - Rare but extremely luminous. A-type stars are white or blue-white, like Sirius. F and G-type stars are yellow-white to yellow, including our Sun (G2V). K-type stars are orange dwarfs. M-type stars are cool red dwarfs - The most common stars in the galaxy.

Drag each star or description into its correct spectral class. See also our planets by type quiz for more astronomy knowledge.

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G-type

The Sun

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Alpha Centauri A

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