1492:Columbus lands in America
Although Leif Ericson was reportedly the first to land in America in 1000, his voyage ultimately brought about little change to the continent. On October 12, 1492, Christopher Columbus and his crew landed in what is now part of the Bahamas. With him, he brought about European colonization and slew of changes: Christianity, disease, guns, and horses to name a few.
1543:Copernicus disputes earth is center of universe
Nicolaus Copernicus may have tried to avoid public outrage by waiting until the year of his death to publish On the Revolutions of Heavenly Spheres, but he was the first person to propose that the sun, and not the earth, was at the center of the universe. Later, Johannes Kepler argued the orbital paths of planets were actually elliptical, not circular, and in 1610, despite strong opposition from the Catholic Church, Galileo Galilei used his telescope to prove that the earth does, in fact, revolve around the sun.
1666:Newtons Law of Gravity
In 1666, after watching an apple fall from a tree, Isaac Newton realized that the force holding any object to the Earth is the same as the force holding the moon and planets in their orbits. He created a mathematical equation that defined the gravitational pull between two objects. In essence, our bodies pull on the Earth just as the Earth pulls on our bodies. However, since we weigh so much less than the Earth, we do not affect its motion at all.
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