Pluto was long considered our ninth planet, but the International Astronomical Union reclassified Pluto as a dwarf planet in ...

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

The dwarf planet actually gets closer to the sun than Neptune is for 20 years out of Pluto's 248-Earth-years-long orbit, providing astronomers a rare chance to study this small, cold, distant ...

Concerning its orbit, however, astronomers don't disagree that the world has yet to complete a single orbit since Tombaugh first spotted Pluto in imagery. You may like New dwarf planet discovered ...

Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid before it drifts ...

The definition that was eventually accepted requires that a planet must 1) orbit the Sun, 2) be round and 3) have cleared it orbit. The third criterion excluded Pluto, as it shares its orbit with ...

Pluto's status has been a heated debate for decades with arguing over a dwarf planet classification. Here's what international standards say in 2023.

Pluto's strange orbit manages to protect the dwarf planet from a grisly fate, in large part thanks to the influence of the other worlds of the outer solar system, models suggest.

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

Pluto should be reclassified as a planet, according to a new research study. In a paper published in the journal Icarus, Philip Metzger, a planetary scientist at the University of Central Florida ...

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.