Learn about the moons of our solar system with this detailed poster, from Discover Magazine.

Each of the solar system's 178 moons tells a story. Whether they started as planetary twins or as wayward rocks captured by a planet's gravity, these natural satellites can be as geologically active, weather-beaten or just plain weird as any planet. Learn about a few with this poster!

Size: 11" x 17" (folded 11" x 8.5")