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Colliding Galaxies

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I am very sure that most people know about galaxies. But, what you (probably) didn’t know is that galaxies can emerge and form a different type of galaxies. Some can be really odd, you know! Why do galaxies collide? Because of gravity. Well, not gravity from the galaxies, it’s the gravity from dark matter. Later, they start getting nearer and nearer and nearer and finally they collide. However, this process may take billions of years. When galaxies collide together, what happens to all the planets and stars? NOTHING. Nothing happens because galaxies are actually mostly empty space. So the stars and planets never collide. The only thing that happens is that both galaxies become one and the galaxies get a new form. Oh, and also, it gets a new name. An example of colliding galaxies that will collide to each other is the Milky Way galaxy and the Andromeda galaxy. It will collide in around 4 billion years. The new galaxy will be formed in 10 billion years. In numerals tha...