is a family of objects, which orbit the sun. They were born 4.6 billion years ago. The most important are the 9 planets, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Mercury is the closest to the sun and Pluto is the farthest. also includes the stars and the moon. The Heliocentric model was created in 1543 and it shows how functions. In the model the stars and the sun are stationary they don’t move. The planets including earth move in circles around the sun in an eastward motion. It takes a year for the ea ....