How long does it take Pluto to orbit the sun? Learn more about how this planet makes one lap around our Solar System.

Many people hold Pluto close in their hearts and refuse to abandon the assertion that it is a planet, although science ...

Pluto hasn't been a planet for almost 20 years. In the early 2000s, scientists discovered several objects of a similar size to Pluto. So, during the summer of 2006, members of the International ...

When did Pluto stop being a planet, and why? Pluto was always in a tough spot when it came to being a planet. Just 1,477 miles across, it's only one-fifth the diameter of Earth.

Since Pluto is so far from Earth, little was known about the dwarf planet's size or surface conditions until 2015, when NASA's New Horizons space probe made a close flyby of Pluto.

New data captured by the James Webb Space Telescope has finally given astronomers new clues about how Pluto cools itself.

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.

OF201, the object belongs to the same all-star family as Pluto: dwarf planets. Its diameter, roughly 435 miles (700 km), is ...

Poor Pluto. On August 24, 2006 at the International Astronomy Union (IAU) General Assembly the ninth planet was scrubbed only 76 years after its discovery. Even weirder is that it actually got ...

In 2006, the IAU determined Pluto did not meet the qualifications to be a planet because it doesn’t clear its orbital path like the other planets do. Mercury’s diameter is bigger than dwarf ...

On Aug. 24, 2006, the International Astronomical Union voted to downgrade Pluto to a dwarf planet, causing controversy both scientifically and culturally.

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.