The Solar System is a vast and mysterious realm, filled with planets, moons, asteroids, and icy bodies waiting to be discovered. This journey will take us through the outer planets and beyond ...

Some astronomers theorize that a mysterious ninth planet, which so far remains undetected, could explain an unusual clustering of objects and other anomalies observed in the outer solar system.

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent ...

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

Analysis of an ancient meteorite suggests that rocky planets both near and distant from the sun may have formed at the same time, challenging current models of our solar system’s evolution.

Astronomers have discovered the earliest seeds of rocky planets forming in the gas around a baby sun-like star, providing a precious peek into the dawn of our own solar system.

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in our solar system.

The 2007 Exploring Space Lectures, Journey Through the Outer Solar System, will feature four world-class scholars discussing current missions to the distant realm of the gas giants, the icy Kuiper ...

Planet Nine is a hypothesised planet that is five to 10 times the mass of Earth, orbiting in the outer solar system at about 400 to 800 times the Earth-sun distance.

A strange fossil at the edge of the solar system just shook up Planet Nine theories Date: July 20, 2025 Source: National Institutes of Natural Sciences Summary: A tiny object far beyond Pluto ...