mike_2006_123 - 13.01.2016 17:45How many planets are there in the solar system?..

John Twist - 15.01.2016 00:40It's a controversial question as scientists argue what is planet and what is not. It's been thought that there were 9 planets in the Solar System. However, the scientists have questioned whether Pluto should be considered a planet, so some say there are only 8 planets.