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

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

Giant, ridge-like structures of methane ice, known as "bladed terrain," may be much more abundant along Pluto's equator than previously realized, a new study suggests.

Pluto's dinky diameter wasn't the official reason it was demoted from the planetary club back in 2006, but symbolically, size was the last straw. When Caltech astronomer Mike Brown spotted the object ...

The researchers suggest that the family arose soon after the birth of the solar system, when a Pluto-size body smashed into 2003 EL61, creating the fragments that Brown’s team has found.

One of the most prominent volleys in the dispute came in 2000, when Tyson’s planetarium banished Pluto from a display of the planets. One reason for the snub was that with a diameter of about ...

More Skyscraper-size spires of mehtane ice may cover around 60% of Pluto 's equatorial region — a larger area than scientists previously estimated, new research finds. The study, published July ...