In March, the Dawn mission arrived at Ceres, which lies in the asteroid belt ... reached the far edge of the Solar System, buzzing by Pluto before continuing on to the Kuiper belt.

Then, in the summer of 2006, Pluto was demoted. This wasn't the first time such a debate happened. The discovery of Ceres in the early 1800s prompted debate among scientists. Ceres is the largest ...

This year will be bigger: We get to see some of the most unusual objects in our Solar System for the first time — the dwarf planets Pluto and Ceres. Like all the cool kids, these robotic probes ...