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The Diverse Galaxies

Sierra College Astronomy Department. 2. The Diverse Galaxies Galaxy Classification. Until the 1920s, we thought of our own galaxy as the Island Universe" and that everything we saw lay in our galaxyIn 1924, Edwin Hubble found Cepheid variables in three spiral nebulae, including one in Andromeda,

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The Diverse Galaxies

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    1. © Sierra College Astronomy Department 1 The Diverse Galaxies

    2. © Sierra College Astronomy Department 2 The Diverse Galaxies Galaxy Classification Until the 1920s, we thought of our own galaxy as the “Island Universe” and that everything we saw lay in our galaxy In 1924, Edwin Hubble found Cepheid variables in three spiral nebulae, including one in Andromeda, proving that they were actually spiral galaxies. The proof that galaxies existed outside the Milky Way expanded the scope of the universe. Today it is estimated that over 100 billion galaxies exist in the visible Universe. The Hubble Classification Hubble divided galaxies into three basic types: spiral, elliptical, irregular.

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