Astronomers have discovered a "fossil" world lying in the outskirts of the solar system, according to new research.

The Solar System is a fascinating place, with each planet orbiting the Sun at its own unique distance. But how far apart are these planets, and how do they travel through space? Uncover the true scale ...

The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

It lies beyond Pluto at a distance of 71 AU, or astronomical units – putting it 71 times the average distance between the sun and Earth, according to the National Astronomical Observatory of ...

A tiny object far beyond Pluto, newly discovered by the Subaru Telescope, could reshape our understanding of the early Solar System. Named 2023 KQ14, this rare “sednoid” follows an unusual orbit that ...

Typically, telescopes are synonymous with bringing far-off objects close, but the newest member of the solar system was discovered using wide-field imaging. The Subaru Telescope has spotted a distant ...

Science News: NASA has discovered the interstellar comet 3I/Atlas, located 4.5 au from the Sun, offering a rare glimpse into celestial bodies from outside our solar system. Scientists confirm it ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's not aliens.) ...