Biggest Mysteries of the Dwarf Planet Ceres

Embedded in the asteroid belt is a dwarf planet that features a 3-mile-high (5 kilometers) pyramid-shaped mountain and intriguing bright patches that scientists are still trying to understand. This world's name is Ceres, and it is currently under scrutiny by NASA's Dawn spacecraft, which began orbiting the dwarf planet in March 2015. To get more insight, Space.com asked Dawn principal investigator Christopher Russell of UCLA for his thoughts on the biggest mysteries of Ceres.