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.

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

Today, NASA released the first ever close-up photographs of Pluto. The images showed icy mountains and a mysterious pale patch shaped like a heart. Judy Woodruff speaks to science correspondent ...

Scientists with NASA’s New Horizon spacecraft have discovered a mountain range on Pluto that is a bit larger than the state of Alaska and may be covered with methane-infused snow.

Pluto is 100 miles smaller than the smallest planet but is not a major planet. Here's which planet in our solar system takes the title instead.

Astronomers believe a planetary body collided with Pluto early in its history to create a gigantic heart-shaped feature on the dwarf planet.

The only larger dwarf planets in our solar system are Pluto, which has a diameter of 1475 miles, and Eris, which has a diameter of 1445 miles. 2007 OR10 is the third biggest dwarf planet in our ...

Pluto is so far from Earth, and so small, that its size isn't precisely known. When forming their model, the researchers assumed that the diameter of Pluto is roughly 1,429 miles (2,300 kilometers).

A so-called 10th planet discovered last year is bigger than Pluto, scientists say they have confirmed.

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 ...