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Galaxies . A huge cluster of stars , dust, and gas held together by gravity Can be 100,000 light years from end to end Remember 1 light year = 5,878,625,373,183 miles. There are three types of galaxies. 1. Elliptical Galaxy . Round or oval-shaped Most common shaped galaxy found nearby.
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A huge cluster of stars, dust, and gas held together by gravity • Can be 100,000 light years from end to end • Remember 1 light year = 5,878,625,373,183 miles
1. Elliptical Galaxy • Round or oval-shaped • Most common shaped galaxy found nearby
2. Spiral Galaxy • Have pinwheel shaped arms • The Milky Way is this shape
3. Irregular Galaxy • Do not fit into the other two categories • Least common galaxies