註釋
Is there anyone who has not looked at the dark sky, and the shining points of light above us, and asked themselves questions about what is out there? Where did our planet come from? When did the universe begin? Could we live on another planet? And one question above all - is there life anywhere else in space? Begin a journey into space - where spacecraft travel at thousands of kilometres an hour, temperatures are millions of degrees, and a planet may be hard rock - or a ball of gas. In space, everything is extraordinary...
