A galaxy contains a huge amount of gas. There are billions of stars in galaxy. Every galaxy has a supermassive black hole in its center. We live on Earth. A galaxy is held together by gravity. There are many galaxies. There are many kind of galaxies. There are spiral galaxies, elliptical galaxies, irregular galaxies. Our Earth is part of solar system. Our solar system is a small part of Milky way galaxy. Sometimes galaxies get too close and smash each other.
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