A SPACE TRAVELLER'S GUIDE TO THE SOLAR SYSTEM Here the astronomer and broadcaster Mark Thompson describes what a journey through the solar system might be like, from the preparations for take-off on Earth to arrival at the edge of interstellar space many years later. On the way he discusses what we know about the origins of the planets and their moons, describes physical features that would be visible and reflects on the challenges of navigation, weightlessness and living in a confined spaceship.