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Have you ever wondered how astronomers know very well what makes up the atmosphere of the distant planet? How do astronomers know that a galaxy is soon on your way us or faraway from us? The answer to both these questions is in mathematics.

Have you ever wondered how astronomers know very well what makes up the atmosphere of the distant planet? How do astronomers know that a galaxy is soon on your way us or faraway from us? The answer to both these questions is in mathematics.