The debate over Pluto’s planetary status has been ongoing since its reclassification as a “dwarf planet” in 2006 by the ...

Pluto’s heart-shaped feature, known as Tombaugh Regio, has captivated scientists and the public alike since its discovery.

The science community may be ecstatic over the discovery of a ninth planet, but the former planet "Pluto" had a totally different reaction.

With a diameter of 1,440 miles, Pluto is farthest from the sun. While major planets make roughly circular orbits, Pluto ...

Come Tuesday, Clyde Tombaugh will pass within 7,800 miles of the icy world he discovered 85 years ago.

NASA unveiled more discoveries about Pluto Friday from the data that's begun trickling back after this week's historic fly-by.

Poisonous carbon monoxide gas has been discovered in the atmosphere of the dwarf planet Pluto, after a worldwide search that lasted nearly two decades, according to a new study that also detected ...

On Aug. 30, 1992, astronomers spotted an object orbiting the sun beyond Pluto for the very first time. Before then, Pluto was believed to be the most distant planetary body of our solar system. No one ...