But the best parts of the video are probably these two stills, which offer some context on Earth's place in the solar system. First, the video shows the planets organized by mass. Earth is one of the four terrestrial planets--the solid, metal-based planets, as opposed to the gas giants--along with Mercury, Venus, and Mars. Even put together, they make up only a small fraction of the solar system's mass. Look how that compares to the mass-hogging monster that is Jupiter.