Latest photographs of Pluto from New Horizons

NASA’s New Horizons Finds Second Mountain Range in Pluto’s ‘Heart’ Pluto’s icy mountains have company. NASA’s New Horizons mission has discovered a new, apparently less lofty mountain range on the lower-left edge of Pluto’s best known feature. (NASA)

Frozen Carbon Monoxide in Pluto’s 'Heart' Peering closely at the “heart of Pluto,” in the western half of what mission scientists have informally named Tombaugh Regio (Tombaugh Region), New Horizons’ Ralph instrument revealed evidence of carbon monoxide ice. The contours indicate that the concentration of frozen carbon monoxide increases towards the center of the “bull’s eye.” (NASA)

IN SPACE - JULY 11: In this handout provided by the National Aeronautics and Space Administration (NASA), the dwarf planet Pluto is shown at distance of about 2.5 million miles July 11, 2015. NASA's New Horizons spacecraft is nearing its July 14 flyby when it will close to a distance of about 7,800 miles (12,500 kilometers). The 1,050-pound piano sized probe, which was launched January 19, 2006 aboard an Atlas V rocket from Cape Canaveral, Florida, is traveling 30,800 mph as it approaches. (Photo by NASA/JHUAPL/SWRI via Getty Images) (2015 NASA)

IN SPACE - JULY 14: In this handout provided by the National Aeronautics and Space Administration (NASA), a close-up image of a region near Pluto's equator shows a range of mountains rising as high as 11,000 feet (3,500 meters) taken by NASA's New Horizons spacecraft as it passed within 7,800 feet of the dwarf planet on July 14, 2015. The 1,050-pound piano sized probe, which was launched January 19, 2006 aboard an Atlas V rocket from Cape Canaveral, Florida, zipped by the planet yesterday. (Photo by NASA/APL/SwRI via Getty Images) (2015 NASA)

This Monday, July 13, 2015 combination image released by NASA shows Pluto, left, and its moon, Charon, with differences in surface material and features depicted in exaggerated colors made by using different filters on a camera aboard the New Horizons spacecraft. In this composite false-color image, the apparent distance between the two bodies has also been reduced. (NASA/APL/SwRI via AP)

This July 14, 2015 photo provided by NASA shows an image taken from NASA's New Horizons spacecraft showing a new close-up image from the heart-shaped feature on the surface of Pluto that reveals a vast, craterless plain. (NASA/JHUAPL/SWRI via AP)

This photo taken Tuesday, July 14, 2015, at approximately 6:30 a.m. EDT, shows Pluto's largest moon Charon, left, with a captivating feature, a depression with a peak in the middle, shown in the upper left corner of the inset image at right. (NASA/JHUAPL/SwRI via AP)

IN SPACE - JULY 8: In this handout provided by the National Aeronautics and Space Administration (NASA), the dwarf planet Pluto (R) and it's largest moon Charon is shown at distance of about 3.7 million miles from NASA's New Horizons spacecraft July 8, 2015. The craft is nearing its July 14 flyby when it will close to a distance of about 7,800 miles (12,500 kilometers) from Pluto. The 1,050-pound piano sized probe, which was launched January 19, 2006 aboard an Atlas V rocket from Cape Canaveral, Florida, is traveling 30,800 mph as it approaches. The color information in the image, obtained earlier in the mission from instruments, has been added. (Photo by NASA/JHUAPL/SWRI via Getty Images) (2015 NASA)

IN SPACE - JULY 14: In this handout provided by the National Aeronautics and Space Administration (NASA), Pluto nearly fills the frame in this image from the Long Range Reconnaissance Imager (LORRI) aboard NASA's New Horizons spacecraft, taken on July 13, 2015, when the spacecraft was 476,000 miles (768,000 kilometers) from the surface. This is the last and most detailed image sent to Earth before the spacecraft's closest approach to Pluto. New Horizons spacecraft is nearing its July 14 fly-by when it will close to a distance of about 7,800 miles (12,500 kilometers). The 1,050-pound piano sized probe, which was launched January 19, 2006 aboard an Atlas V rocket from Cape Canaveral, Florida, is traveling 30,800 mph as it approaches. (Photo by NASA/APL/SwRI via Getty Images) (2015 NASA)

IN SPACE - JULY 11: In this handout provided by the National Aeronautics and Space Administration (NASA), the dwarf planet Pluto (R) and Charon are shown July 11, 2015. NASA's New Horizons spacecraft is nearing its July 14 flyby when it will close to a distance of about 7,800 miles (12,500 kilometers). The 1,050-pound piano sized probe, which was launched January 19, 2006 aboard an Atlas V rocket from Cape Canaveral, Florida, is traveling 30,800 mph as it approaches. (Photo by NASA/JHUAPL/SWRI via Getty Images) (2015 NASA)

IN SPACE - JULY 13: In this handout provided by the National Aeronautics and Space Administration (NASA), Pluto's largest moon Charon is shown from a distance of 289,000 miles (466,000 kilometers) from the Long Range Reconnaissance Imager (LORRI) aboard NASA's New Horizons spacecraft, taken on July 13, and released July 15, 2015. New Horizons passed by Pluto July 14, closing to a distance of about 7,800 miles (12,500 kilometers). The image was combined with color information taken from the craft's Ralph instrument. The 1,050-pound piano sized probe was launched January 19, 2006 aboard an Atlas V rocket from Cape Canaveral, Florida, (Photo by NASA/APL/SwRI via Getty Images) (2015 NASA)

New Horizons Captures Two of Pluto's Smaller Moons While Pluto’s largest moon Charon has grabbed most of the lunar spotlight, two of Pluto’s smaller and lesser-known satellites are coming into focus via new images from the New Horizons spacecraft. (NASA)

This Tuesday, July 14, 2015 image provided by NASA on Wednesday shows one of Pluto's five moons, Hydra, about 27 miles (43 kilometers) by 20 miles (33 kilometers) wide, made by the New Horizons spacecraft. (NASA/JHUAPL/SwRI via AP)