historical dates By kabir batta 340 BCE Aristole.earth is in the middle of the solar system 200 BCE aristarchus. idea of the sun being in the middle of the solar system 150 BCE Ptolemy.suggests the idea of epicycles on how the planets move. 1543 copernicus. suggests the sun is in the centre of the solar system 1594 Galileo. made advencements in the telescope 1600 Kepler.He suggests three laws of planetary motion and that orbits are ellipses and not circles. 1700 Isaac neewton.Suggested the idea of planetary gravity. 1781 William Herschel .Discovered Uranus 1929 Edwin Hubble. the universe is expanding