Solar System
Our solar system consists of nine planets that rotate around the sun. Some people split the solar system into the inner solar system and the outer system. The inner solar system consists of the sun, Mars, Mercury, Venus and the Earth. It is called the inner solar system because all five of these bodies are relatively close to each other. The outer solar system is called that because these other five planets are much further away. In fact the inner and outer solar systems not only have a lot of space between them they also have a massive asteroid belt. The outer solar system consists of Uranus, Saturn, Neptune, Pluto, and Jupiter. Up until the 17th century nobody really knew what was up in space but most believed that there were six planets, the moon and the sun and that the earth was what everything rotated around. Gallileo changed all that in 1610 when he invented a telescope and started finding other objects up there in space. He also determined that the earth actually orbited the sun which didn’t make him that popular with his friends in the church. Over the next centuries more and more bodies were being discovered and named in our solar system. This included the other planets of course but 130 satellites of these planets as well. Some of these moons are even bigger than the planet Pluto. As space travel began in the 1960’s more and more knowledge came to