Tenth Planet Detected in Solar System Astronomers say they've discovered a new planet in orbit around the sun. The planet is larger than Pluto, whose rank as a planet has sometimes been debated.

Scientists Discover Solar System's Tenth Planet -- Bigger Than Pluto. ScienceDaily . Retrieved June 4, 2025 from www.sciencedaily.com / releases / 2005 / 07 / 050729224136.htm ...

F or most of the 20th century, some astronomers were convinced that a 10th planet — Planet X — lay somewhere beyond Neptune. They inferred the existence of such a planet by its apparent ...

Scientists think there could be a planet the size of Mars in the Kuiper belt, a ring of material in the outer solar system beyond Neptune. Heather Roper/LPL Astronomers find new exoplanets all the ...

World Asteroid Day 2025 is upon us! Here's how you can celebrate the event by livestreaming real-time views of near-Earth ...

If there's another planet out there in our solar system, where could it be? That's a question that astronomers have been trying to answer for years, but they've been coming up empty-handed. We've ...

A Mars-sized planet appears to be lurking at the edge of the solar system, scientists have announced. The "planetary mass object" seems to be disrupting the orbits of other, smaller rocky bodies ...

A California astronomer has discovered what he believes is the 10th planet in our solar system, a group of NASA-funded researchers… ...

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

All eight of the solar system’s “major” planets appear in this illustration, ... Should it be discovered, whether you want to call it the ninth or 10th or 1,000th planet is up to you.