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Feb 19, 1473
Copernicus was born
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Mar 3, 1541
Coppernicus published a short austronomical Manuscript
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Feb 15, 1564
bith of Galilao
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Galilao's first known astronomical observation
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Galileo published this letters about the sunspots
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Newtons birth
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Publication of Mathematical Principles of Natural Philosophy
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Newton died
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Hubble was born
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Period: to
Hubble helped design the Hale Telescope in California
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Hubble proves that the universe is expanding
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Hubble died of a heart attack