TIMHi, I'm Tim Peake. I'm an astronaut based here at the European Space Agency in Germany, and from December 2015, to June 2016, I spent six months orbiting Earth on the International Space Station.

Johannes Kepler, a German mathematician born in 1571 ... Although the central body of the Solar System is about 93 million miles from our planet, it does not remain indifferent to us.

Everyone knows about the Solar System, and the planets that make it ... Until the likes of Copernicus, Kepler and Galileo came along, everyone thought the planets (that they knew about) revolved ...