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He was the first to say that the earth is in the centre of the solar system
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He was the first to challenge Aristotle's theory, saying that the sun is in the centre
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He made the idea of epicycles to show how the planets move (The earth is still in the centre)
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He was the second person to say that the sun was at the centre of the solar system
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He was the inventor of the telescope. He also showed that Jupiter had moons
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He made the 3 laws of planetary motion. He also introduced the idea of orbital planes being in ellipses(ovals) and not circles.
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The man who discovered gravity. Later in his life,he made the 3 laws of physics that we use to this day.
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The man who discovered Uranus.
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The man who discovered the fact that the universe is continually growing. He is also the man who created the Hubble telescope.