NASA's New Horizons spacecraft is the first probe sent to Pluto, and it's scheduled to arrive in July 2015. This is an artist's concept of the spacecraft flying past Pluto.

Excerpt from (CNN) — Three miles away from , in an unchartered slice of our solar system, a small space probe is shaking off its deep sleep and getting ready to become the first spacecraft to visit Pluto and its moons.

It’ the “beginning of the mission’ : the of Pluto and its many moons in 2015,” said Alan Stern, New Horizons principal investigator from Southwest Research Institute, Boulder, Colorado, in a NASA news release.

NASA’s New Horizons spacecraft was launched on January 19, 2006. It’s down to the final 162 million miles of its journey and arrive July 14, 2015. New Horizons has had 18 hibernation periods totaling 1,873 days to save wear and tear on its components. This was its nap.

Mission operators at the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland, say a preprogrammed command ordered the spacecraft to switch from hibernation to “active” at 9:53 p.m. (EST) December 6.

The probe is 27 inches (0.7 meters) , 83 inches (2.1 meters) long and 108 inches (2.7 meters) wide. It weighed 1,054 pounds (478 kilograms) at launch.

New Horizons is packed with cameras and other instruments, and it should start sending back glimpses of Pluto on January 15. By mid-May, we should get “better than Hubble” . Until now, the best image we’ve had of Pluto is a pixilated photo from the Hubble Space Telescope. We’ll also see Pluto’s five moons: Charon, Nix, Hydra, Kerberos and Styx.

“New Horizons is on a journey to a new class of planets we’ve never seen, in a place we’ve never been before,” says New Horizons Project Hal Weaver of APL.