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Galileo’s discoveries about the solar system and Milky Way revolutionized our view about the universe. He created his own telescope, a recent discovery in his time, and discovered that the Moon is made up of pits, craters, and mountains. The moon was previously believed to have been flat. He studied Jupiter and saw that four moons orbited it. This challenged many common beliefs in his time. He studied the phases of Venus and saw that the planets orbit the sun, not the earth. He observed the sun and saw many dark sunspots. He laid the foundation for modern space probes and telescopes. In his time, many people believed the sun and the planets orbited the earth, but his discoveries disputed that and proved Copernican’s idea. People in his time knew very little about the universe, but he discovered many solar beings that introduced a new look on the universe. He discovered facts about the universe that no one in his time could comprehend. He changed people’s views about the solar system and the Earth. People’s views about the universe were very close minded during his time and he introduced many discoveries that attempted to open their minds about the universe.
"Our Solar System: Galileo's Observations of the Moon, Jupiter, Venus and the Sun." Solar System Exploration. NASA, 10 Feb. 2011. Web. 19 Mar. 2014.