Topics: Universe, Galileo Galilei, Nicolaus Copernicus Pages: 2 (448 words) Published: April 28, 2013

Astronomy is the study of the universe. Astronomy has evolved over a long period of time, and slowly it has become more advance. In ancient cultures, people used the stars, planets, and moon to indicate the time. In fact, people built observatories to watch objects in the sky. Ancient cultures didn’t know everything about the universe, but the first calendars, came out of their observations. Our modern calendars consist of years, which is the how much time the Earth takes to orbit once around the sun, months which is the amount of time the moon takes to orbit around the Earth, and days which is the time taken for the Earth to rotate once on its axis. Claudius Ptolemy and Nicolaus Copernicus were to early scientists, whom had a major influence on the way people thought about the universe. They thought the universe only consisted of the sun, the moon, and the planets. Later in 140CE, a man named Ptolemy came up with an idea called the Ptolemaic theory. His theory was that the Earth was the center of the universe and all the other planets and the sun revolved around it. For over 1500 years, his theory was the most popular. Later in 1543, a man named Copernicus had a new theory that the sun was at the center of the universe, and all the other planets orbit around it. His theory wasn’t as poplar’s as Ptolemy, but overtime his theory was accepted and later was named the Copernican Revolution. Later in the late-1500’s, a man named Tycho Brahe made the most detailed astronomical observations, by using seven large tools. Unfortunately, Tycho Brahe followed the same theory as Ptomely thus being incorrect. After his death, his assistant, Johannes Kpler, continued Brahe’s work. While Kepler did not agree with Brahe’s theory, he still found his data very valuable. In 1609,Kepler said that all the planets revolve around the sun, much like Copernicus’s theory, but Kepler said that the sun was not in the exact center of the universe. In that same year, a man...
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