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Images: Pluto unveiled

See NASA images of Pluto, as seen from the New Horizons spacecraft. The United States is now the only nation to visit every single planet in the solar system. Pluto was No. 9 in the lineup when New Horizons departed Cape Canaveral, Fla, on Jan. 19, 2006. See Pluto discoverer Clyde Tombaugh and the telescope through which he discovered the Pluto at the Lowell Observatory on Observatory Hill in Flagstaff, Ariz. On Tuesday, July 14, 2015, NASA's New Horizons spacecraft, carrying a small canister with his ashes, passed within 7,800 miles of Pluto.

A guided tour of Lowell Observatory stops at the Pluto Discovery Telescope inside the Pluto Dome, Wednesday, Feb. 9, 2005, in Flagstaff, Ariz. It has been nearly 75 years since Clyde Tombaugh first spotted the tiny icy planet of Pluto, on Feb. 18, 1930, and since then Pluto 's very classification as a planet has been questioned. Astronomers agree, though, that the discovery at Flagstaff's Lowell Observatory remains a remarkable one. ASSOCIATED PRESS
Patricia Tombaugh, 92 of Las Cruces,N.M., stands next to a model of the New Horizons spacecraft at the Kennedy Space Center in Cape Canaveral, Fla., on Sunday Jan. 15, 2006. Her late husband, Clyde Tombaugh discovered the planet Pluto in 1930. The spacecraft is planned for a Tuesday launch aboard an Atlas V rocket and will take about 9 years to reach Pluto. ASSOCIATED PRESS
An Atlas V rocket that is to carry the New Horizons spacecraft on a mission to the planet Pluto lifts off from launch pad 41 at the Cape Canaveral Air Force Station in Cape Canaveral, Fla., Thursday, Jan. 19, 2006. The spacecraft could reach Pluto as early as July 2015. ASSOCIATED PRESS
The Atlas V rocket that will carry the New Horizons spacecraft to Pluto moves from the Vertical Integration Facility to the launch pad at the Kennedy Space Center in Cape Canaveral, Fla. on Monday Jan. 16, 2006. The spacecraft which will take 9 to 14 years to reach Pluto is powered by 24 pounds of plutonium. ASSOCIATED PRESS
This July 13, 2015 image provided by NASA shows Pluto, seen from the New Horizons spacecraft. The United States is now the only nation to visit every single planet in the solar system. Pluto was No. 9 in the lineup when New Horizons departed Cape Canaveral, Fla, on Jan. 19, 2006 ASSOCIATED PRESS
This undated photo provided by Johns Hopkins University Applied Physics Laboratory via NASA shows an aluminum canister containing the ashes of Clyde Tombaugh, the American astronomer who discovered Pluto in 1930, attached to NASA's New Horizons spacecraft. On Tuesday, July 14, 2015, the spacecraft is scheduled to pass within 7,800 miles of Pluto which he discovered 85 years ago. ASSOCIATED PRESS
This July 11, 2015, image provided by NASA shows Pluto from the New Horizons spacecraft. On Tuesday, July 14, NASA's New Horizons spacecraft will come closest to Pluto. New Horizons has traveled 3 billion miles over 9½ years to get to the historic point. ASSOCIATED PRESS
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. ASSOCIATED PRESS
Members of the New Horizons science team react to seeing the spacecraft's last and sharpest image of Pluto before closest approach later in the day, Tuesday, July 14, 2015, at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. NASA's New Horizons spacecraft was on track to zoom within 7,800 miles (12,500 kilometers) of Pluto on Tuesday. ASSOCIATED PRESS
Members of the New Horizons science team react to seeing the spacecraft's last and sharpest image of Pluto before closest approach later in the day, Tuesday, July 14, 2015, at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. NASA's New Horizons spacecraft was on track to zoom within 7,800 miles (12,500 kilometers) of Pluto on Tuesday. ASSOCIATED PRESS
In this photo provided by NASA, New Horizons Principal Investigator Alan Stern of Southwest Research Institute (SwRI), Boulder, Colo., left, Johns Hopkins University Applied Physics Laboratory (APL) Director Ralph Semmel, center, and New Horizons Co-Investigator Will Grundy of the Lowell Observatory hold a print of a U.S. stamp with their suggested update since the New Horizons spacecraft made its closest approach to Pluto, at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md. on Tuesday, July 14, 2015. ASSOCIATED PRESS
In this 1931 file photo, Clyde Tombaugh poses with the telescope through which he discovered the Pluto at the Lowell Observatory on Observatory Hill in Flagstaff, Ariz. On Tuesday, July 14, 2015, NASA's New Horizons spacecraft, carrying a small canister with his ashes, is scheduled to pass within 7,800 miles of Pluto which he discovered 85 years ago. ASSOCIATED PRESS
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