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Created the first telescope.
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Found craters on the moon. Discovered that Jupiter is a planet with moons. Cresents on Venus showed that the sun is the center.
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Telescopes became sharper.
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Helps identify Uranus. Larger telescopes helped discovered that we live in a galaxy.
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He helped plan two refracting telescopes on Mount Wilson Observatory.
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Discovered other galxaies. Discovered other galaxies and galaies that are farther away are moving faster away.
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Discovered important evidence of The Big Bang.
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Discovered billions of galaxies in a small point in the sky.
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Discovered that the universe is 13.7 billion years old.
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Looks for habitable planets in distant Galaxies.