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 Kuiper Belt beyond Neptune — and they may soon have the opportunity to find ...

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 ...

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

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

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

In 2016, scientists Michael Brown and Konstantin Batygin suggested that an unseen Planet Nine could explain the unusual ...

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

This hypothetical Neptune-sized planet would circle our Sun on a highly elongated path, far beyond Pluto. It could have ... Neptune before they leave the solar system entirely.