![](c04_fig07.jpg)
Figure 4-7 Trans-Neptunian Objects Pluto and Eris are the two largest trans-Neptunian objects, small worlds of rock and ice that orbit beyond Neptune. Unlike the orbits of the planets, the orbits of these two objects are steeply inclined to the ecliptic: Pluto’s orbit is tilted by about 17°, and that of Eris is tilted by 44°.