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New Horizons in 2005

New Horizons launches in 2006

New Horizons sees Pluto in color

Pluto's spots come into focus

Pluto's 'heart' appears

Charon, Pluto's biggest moon

A final view of Pluto's dark spots

Artist's view of New Horizons

Earth and Pluto compared

Pluto gets a close-up

False color Pluto and Charon

NASA's New Horizons spacecraft launched on a mission to study Pluto and its moons in early 2006. Its closest approach to the fascinating dwarf planet will be on July 14.

This photo from 2005 shows New Horizons in a clean room as technicians work on it before launch. The probe weighs a fairly light 1,060 pounds.

Caption by / Photo by NASA

New Horizons spent over nine years traveling through our solar system to get to Pluto. The journey started on January 19, 2006, with a fiery launch. The probe caught a ride to space with an Atlas V rocket from the Kennedy Space Center in Florida.

Caption by / Photo by NASA

The very first Pluto images from NASA's New Horizons spacecraft were little more than pixelated black-and-white blobs. Taken in April, this image, though still vague, is the first image the probe took in color and sent back to HQ on Earth. It hints at the dwarf planet's reddish hue. The moon Charon is also visible to the lower left.

Caption by / Photo by NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

NASA's New Horizons probe is closing in on its epic flyby of Pluto. As it moves nearer the target, it has taken ever-better images of the dwarf planet. These shots of Pluto, released July 1, show a fascinating series of dark spots along the equator.

"It's a real puzzle -- we don't know what the spots are, and we can't wait to find out," New Horizons principal investigator Alan Stern, of the Southwest Research Institute in Boulder, Colo., said in a statement.

Caption by / Photo by NASA

A heart-shaped surface feature is visible in the lower right of this image of Pluto taken by NASA's New Horizons probe. The dark area to the lower left is unofficially known as "the whale." The spacecraft captured the picture, taken July 7, at a distance of 5 million miles away as it began its flyby sequence to take it up close to the dwarf planet.

Caption by / Photo by NASA-JHUAPL-SWRI

NASA's New Horizons probe captured this image of Pluto's largest moon Charon on July 11 near the beginning of a flyby of the dwarf planet. NASA describes Charon as "a world of chasms and craters."

The dark area near the top is the north pole region. Other dark spots indicate impact craters and possible chasms. Charon is about half the size of Pluto.

Caption by / Photo by NASA/JHUAPL/SWRI

Dwarf planet Pluto is giving scientists plenty to think about as NASA's New Horizons mission has photographed some odd surface features. Of note are a series of four dark spots near the equator.

This image, taken July 11, is the closest look New Horizons was able to capture of the spots. The dark areas are around 300 miles across. The origin of the spots remains a mystery.

Caption by / Photo by NASA/JHUAPL/SWRI

NASA's New Horizons probe doesn't have a film crew flying along behind it as it approaches Pluto. The next best thing we have is this artist's concept of what the spacecraft would look like as it buzzes as close as 7,800 miles away from the dwarf planet.

Caption by / Photo by Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

This mock-up shows how Pluto and Charon compare to Earth, if placed slightly above Earth's surface and viewed from a great distance. Measurements from New Horizons show that Pluto has a diameter of 2,370km, 18.5 percent that of Earth's, while Charon has a diameter of 1,208km, 9.5 percent of Earth's.

Caption by / Photo by NASA

Just before the flyby, NASA posted this photo taken by New Horizons at about 4 p.m. EDT on July 13, about 16 hours before the moment of closest approach. The picture was taken around 476,000 miles (766,000 kilometers) from the surface, and clearly shows the dwarf planet's heart-shaped feature.

Caption by / Photo by NASA/APL/SwRI

On July 13, one day before its closet approach to Pluto, NASA's New Horizons probe took this colorful image of the dwarf planet and its biggest moon Charon. This image is a veritable technicolor explosion compared to other pictures since it shows the two space objects in exaggerated colors.

The false-color photo makes it easy to see surface differences by highlighting craters, ice and other features that would meld together in a normal color image.

Caption by / Photo by NASA/APL/SWRI