Date post: | 29-Dec-2015 |
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Galaxies
• Galaxies are systems of stars, gas and dust
• They exist in a wide variety of shapes and sizes
• 4 basic types - elliptical, spiral, barred spiral, and irregular
Spiral galaxies
• have a central nucleus surrounded by a flattened disc with the stars, gas, and dust organized into a pattern of spiral arms.
• Greater concentration of stars near their centers