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Galileo was the first man to use a telescope to observe the stars and planets, and with the information he gained from this(craters on the moon, moons around Jupiter, sunspots), he was able to challenge the outdated view of the universe--which seemed to think that "the heavens" were perfect. Beyond astronomy, Galileo challenged Aristotle's concepts of motion, and discovered the principle of inertia, and his thoughts were later incorporated into Isaac newton's universal law of gravitation.

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10y ago

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