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April 1, 2024
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Aristotle describes the Geocentric (earth-centered) model of the universe.
Aristarchus proposes a heliocentric (sun-centered) model of the universe that is widley ignored.
Galileo publishes his dialogue on two wold systems, which argues in favor of heliocentric model of the of the universe.
Isaac Newton publishes Principia Mathematicia in which, among other thing, he explains the law of universal gravity
William Herschel constructs the first map of the milky way galaxy.
Ernst opik demonstrates that the Andromeda nebula lies outside the milky way galaxy.
George Lemaitre proposes the big bang theory.
Edwin Hubble discovers evidence supporting the big bang theory.
Arno Penzias and Robert Wilson discover cosmic microwave backround radiation, further evidence supporting the Big Bang theory.
Neil Armstrong and Buzz Aldrin are the first people to walk on the earth.