Synopsis: Isaac Asimov writes about what it would be like to live on, or the possibility of life on, various bodies starting with the Moon and then discussing Venus, Mercury, Mars, the moons of Mars, the asteroids, Jupiter, Saturn, Neptune, Uranus, the moons of the gas giants, and Pluto. Asimov also discusses the possibility and search for Earth like planets orbiting other stars. The final chapter is about the attributes of "Spaceship Earth" and then the challenges of replicating them for long term missions to Mars and beyond.