Science, Maths & Technology
Choosing a Cosmic Name
...system number 8 planets and 5 dwarf planets with over 200 moons orbiting them, nearly 4000 comets and more than a million asteroids, detected by the sunlight they reflect. For those visited by spacecraft we have identified surface features such as impact craters, mountain ranges, volcanoes, cliffs, valleys, and even hydrocarbon lakes. [artist conception of a solar-system...