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Suggested planets moved because of gravity, movement of planets matched his theory of gravity, described the movement of planets with laws of motion.
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found the planet Uranus and its two moons
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applied Newtons theory to the entire solar system.
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Predicted the existence of Pluto
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discovered the period-luminosity relation of Cepheid variables, which was the starting point for astronomers to determine the distance of stars from the earth.
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believed that the universe was ever-expanding
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believed that time does not pass at the same speed everywhere, predicted existence of black holes, said that a rocket travelling at the speed of light will have a higher mass than one not moving.
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he estimated the size of the milky way, and the suns position within it.
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suggested our galaxy was one of billions and ever-expanding, Hubble telescope name after him.
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proposed the Big Bang, and the theory of the expansion of the universe
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stated that the universe was created in one moment, and named it the Big Bang
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discovered a cosmic microwave background radiation, believed to be a faint afterglow of the Big Bang
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