Images sent by NASA’s New Horizons spacecraft reveals possible polar ice cap on Pluto

For the first time, images captured by NASA's New Horizons spacecraft in close fly-by have revealed bright and dark regions on the surface of faraway Pluto, showing signs of ice-bearing polar caps.

The images were captured in early to mid-April from within 70 million miles (113 million kilometers), using the telescopic Long-Range Reconnaissance Imager (LORRI) camera on New Horizons. Using a technique called image deconvolution which sharpens the raw, unprocessed images beamed back to Earth. New Horizons' scientists interpreted the data to reveal the dwarf planet has broad surface markings – some bright, some dark – including a bright area at one pole that may be a polar cap.

''As we approach the Pluto system we are starting to see intriguing features such as a bright region near Pluto's visible pole, starting the great scientific adventure to understand this enigmatic celestial object,'' says John Grunsfeld, associate administrator for NASA's Science Mission Directorate in Washington. ''As we get closer, the excitement is building in our quest to unravel the mysteries of Pluto using data from New Horizons."

Also captured in the images is Pluto's largest moon, Charon, rotating in its 6.4-day long orbit. The exposure times used to create this image set – a tenth of a second – were too short for the camera to detect Pluto's four much smaller and fainter moons.

Since it was discovered in 1930, Pluto has remained an enigma. It orbits our sun more than 3 billion miles (about 5 billion kilometers) from Earth, and researchers have struggled to discern any details about its surface. These latest images allow the mission science team to detect clear differences in brightness across Pluto's surface as it rotates, a NASA release said.

''After traveling more than nine years through space, it's stunning to see Pluto, literally a dot of light as seen from Earth, becoming a real place right before our eyes,'' said Alan Stern, New Horizons principal investigator at Southwest Research Institute in Boulder, Colorado. ''These incredible images are the first in which we can begin to see detail on Pluto, and they are already showing us that Pluto has a complex surface.''

The images the spacecraft returns will dramatically improve as New Horizons speeds closer to its July rendezvous with Pluto.

''We can only imagine what surprises will be revealed when New Horizons passes approximately 7,800 miles (12,500 kilometers) above Pluto's surface this summer,'' said Hal Weaver, the mission's project scientist at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland.

APL designed, built, and operates the New Horizons spacecraft, and manages the mission for NASA's Science Mission Directorate. SwRI leads the science team, payload operations and encounter science planning. New Horizons is part of the New Frontiers Program managed by NASA's Marshall Space Flight Center in Huntsville, Alabama.