Describe The Four Types Of Galaxies In The 1920's

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All galaxies contain star clusters. A star cluster is a group of stars held together by gravity. Open star clusters are collections of six to thousands of usually young stars. Globular clusters are ball-shaped collections of thousands to millions of very old stars. Galaxies are collections of millions to hundreds of billions of stars, planets, gas, and dust, measuring up to one hundred thousand ly across. They came in different shapes and sizes and are spread across the Universe. In the 1920’s, astronomer Edwin Hubble changed the way in which scientists view the Universe. The four types of galaxies that are categorized by shape are elliptical, spiral, lenticular, and irregular. Elliptical galaxy is a large group of stars that together make

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