It must have cleared all other celestial bodies, except its own moons, from its orbit.

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One ...

After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the ...

This huge astrological shift is a total game-changer. Here’s how Pluto in Aquarius will affect you—for the next two decades.

When Pluto was discovered by Clyde Tombaugh in ... because it excludes exoplanets," or planets discovered beyond our solar system, Jean-Luc Margot, a planetary scientist at UCLA, told Live Science.

This hypothetical Neptune-sized planet would circle our Sun on a highly elongated path, far beyond Pluto. It could have a ...

Scientists have been on the hunt for a possible ninth planet in our solar system for some time ... icy body similar to Earth ...

Are there hidden planets in our solar system? New technologies, like the powerful Rubin Observatory, brings us closer to ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Our solar system ...

After a year and a half of moving back and forth between Capricorn and Aquarius, Pluto makes its final entrance into boundary ...