For thousands of years we have been looking at the sky. We have studied other planets and tried to understand them. But to learn more about the planets in our solar system we have to get closer to them. In september 1997 America sent Voyager 1 into space to get a closer look at other planets. Voyager 1 has been travelling through space ever since and has flown past a nimber of planets in our solar system. Now it is nearly 17 billion kilometres form the Earth