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 ...

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 ...

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 ...

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 ...

The planet, circled in white, moves across a background of stars Astronomers have found a tenth planet, ... Tenth planet discovered in outer solar system. By Jeff Hecht. 30 July 2005 ...

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 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.