The solar system is remarkably flat when seen edge on. Most of the planets are neatly spread out along an imaginary, flattened disk. Astronomers say they all orbit nearly in the same plane.

Mercury deviates a little from this flat plane.

Most of the planets have one or more moons, the exceptions being Mercury and Venus, which don't have moons. The planet with the most moons in the solar system is Jupiter, with over 60 of them.