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Came up with the theory of the heliocentric meaning that the sun was the center of the universe going against what Ptolomy said saying the Earth was the center of the universe.
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Publishes an essay describing the blood being drawn from the veins in the torso which drew William Harvey into his discovery of blood circulating the body. The work was known as the "Venesection Letter"
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Made observations of a comet and was able to prove that the comet was further away than the moon by measuring its parallax
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Published his book "Astronomia Nova" containing his first two laws of planetary motion. The first appearance of modern "natural laws"
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Using his new telescope, Galilei uses it to make observations of the solar system. One being that the moon was irregualr with a rough body, the Milky Way is composed of many stars, Jupiter had satellites and he observed Saturn's sunspots and the phases of Venus. He then publishes his findings in "The Starry Messenger"
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Published his book 'Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus' in which he stated his theories explaining how the heart propelled the blood in a circular course throughout the body
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Published his book "Principia" in which it included his three laws of motion and his expansion of the idea of universal gravitation.
