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 1977, 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 pasr a number of planets in our solar system. Now, it is nearly 17 billion kilometres form the Earth!