NASA's New Horizons probe has ended its last hibernation period on December 6. The mission team is ready for its ambitious journey to Pluto. The probe has already covered a distance of 3 billion miles.
Pluto lies in the Kuiper Belt, which consists of billions of icy bodies and starts beyond the orbit of Neptune. Pluto does not have any craters because its surface is composed of thick layers of nitrogen ice that may be soft and not have the capability to shape craters.