Every day, scientists are learning more about our solar system, and it is a more fascinating place than we had ever imagined. In this illustrated guide, Marcus Chown explores the planets, dwarf planets, moons, asteroids, comets, and more, as well as the historical figures who aided in their discoveries. Included here are the 2020 journey of Mars rover Perseverance, a view of the volcanoes of Io, the latest images of Pluto from NASA's New Horizons probe, and a simulation of what the mysterious Oort Cloud might look like.