The universe was once a vast, unexplored area; an area of ​​the unknown. People looked up to the sky in wonder and awe, curious about what was beyond the Earth. What were these lights in the sky? Where did they come from? How did they get there? Over time, the universe composed of stars and planets evolved. What we didn't know before, we know now: our cosmos has changed enormously, transforming into what we today call our solar system. Before people had the knowledge and technology we have today, the celestial skies were a realm of endless speculation and inspiration. People around the world have created their own myths and explanations about the cosmos and the celestial bodies that make it up. About six thousand years ago, the Sumerians believed that Earth was at the center of the universe. The Babylonian and Greek civilizations transmitted this same belief throughout their centuries, describing the celestial sky as a cosmos revolving around the earth. Looking back in history, the Greeks were the first to put forward the idea that planet Earth was a sphere (today known as a flattened ellipsoid). Then, around 340 BC, a Greek philosopher named Aristotle discovered some of our most influential and fundamental theories that helped further prove this idea. Aristotle first proposed that we always witness the sails of a ship approaching the horizon first, and then its frame. This suggested that the ocean surface must be curved and not flat as once thought. Second, Aristotle discovered that lunar eclipses were generated by the shadow that the Earth cast on it. This further proved that if the Earth were flat, the shadow it cast on the Moon would not apply... middle of paper ... Years later, this non-uniformity in the antediluvian has began the formation of galaxies and ancient stars out of pockets of gas condensing under the effect of gravity. About five billion years ago, these pockets of gas that resided in a spiral channel of the Milky Way formed the Sun. A huge circle of gas and waste that swirled around the ancient Sun formed on planets, including Earth, which is predictably 4.6 to 4.5 billion years old. years. Works Cited Adskin, Alaina. Humanities 242. Here we go!. Np, February 22, 2011. Web. December 1, 2011. “Big Bang Theory – An Overview.” » All about science. Np, and Web. December 1, 2011. Cessna, Abby. “Heliocentric model”. The universe today. Np, June 22, 2009. Web. December 1, 2011. “Isaac Newton.” Scientists: Their Lives and Works. Gale, 2006. Biography of Gale. December 2011. “The Universe”. The big view. Np, and Web. December 1. 2011.