The world is All about Facts Today's world we all lived a certain life in our lives. We were a very lucky to be able and loved. We have to know all that facts move around us. Earth-centric and sun-centric universe The Greek astronomer Claudius ptolemy(Estimated between 100 and 178 AD) believed to be the Earth-centric universe. He believed that the earth is stable and that all the planets are rotating around the earth. Suddenly Poland astronomer Nicolas Copernicus (1473-1543AD) recounts a new breakthrough idea of the Sun-centric universe. But Ptolemy's idea was so convincing in the mind that Copernicus's ideas were suppressed. Later, Italy scientist Galileo Galilei (1564-1642 AD) monitored with the help of telescopes and the mathematician and astronomer Johannes Kepler(1571-1630AD) with the help of mathematical evidence proved that Copernicus's ideas are correct.He also realizes that the planets are not circular around the sun, but on the elliptical...