Prepare yourself—the Pluto debate has returned and people are not going to be able to shut up about it. They’re going to have a lot of opinions and they’re going to need to share them ...

On July 14, 2015, a spacecraft flew by Pluto for the first time! NASA's New Horizons spacecraft spent 9.5 years making the ...

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 was demoted from a planet to a dwarf planet in 2006. So why is its status still so controversial today? ... It must have enough mass to draw itself into a round shape.

Pluto was once considered the ninth planet in the solar system, it was demoted in 2006 to dwarf planet status. We explore this icy body in more detail here.

Meanwhile, many astronomers admit that while they still call Pluto a planet, they do so only because of historical precedent: It's been part of the world's consciousness for more than 70 years.

The year was 2015. After traveling billions and billions of miles through the Erebus, New Horizons encounters the boatman, and the somber lord of the departed. The spacecraft could have been ...

Yet, something was odd about Pluto. While Planet X was estimated to be about six times more massive than Earth, Pluto’s mass is only 20% that of the Moon, itself 1% of the Earth’s mass.

Did Pluto ever actually stop being a planet? Experts debate. It’s been 18 years since Pluto’s celestial status was called into question—yet the matter seems far from settled.

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.

For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical Union (IAU) redefined what constitutes a planet, leading to Pluto’s ...