NASA's Pluto-bound New Horizons spacecraft has spotted surface features on the icy world, including a possible polar cap, images released on Wednesday show.
With 60 million miles (97 million km) left to go before its July 14 encounter, New Horizons already has been able to make out surprising light and dark patches on the surface of Pluto.
"We are starting to see intriguing features, such as a bright region near Pluto's visible pole," NASA science chief John Grunsfeld said in reference to what scientists believe could be a polar ice cap.
In the images, Pluto appears as a small, highly pixillated blob, but already scientists can see there is something very odd about its surface.
"It's rare to see any planet in the solar system, at this low resolution, displaying such strong surface markings. If you had similar images of Mercury, or images of even Mars, you would not see the same kinds of big surface units going by as you do here on Pluto. That's very promising," New Horizons lead scientist Alan Stern said.
Because Pluto is tipped onto its side, similar to Uranus, New Horizons has a steady gaze on one of its polar regions, which appears in the images to be consistently brighter than other areas. Scientists suspect the pole is covered by a highly reflective cap of nitrogen ice.
