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

Trans-Neptunian objects (TNO) are some of our solar system's lesser-known objects. They number in the thousands, and they get their name from their orbits. These dwarf planets orbit the sun at a ...

Tucson's Planetary Science Institute contributes to tracking mystery space objects that help reveal secrets of the solar ...

A team of astronomers led by the Center for Astrophysics | Harvard & Smithsonian has discovered a rare object far beyond ...

Discovered through the Formation of the Outer Solar System: An Icy Legacy (FOSSIL) survey using the Subaru Telescope in ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

An oddly tilted object beyond Neptune moves in perfect sync, one orbit for every ten of Neptune’s, and scientists are ...

The James Webb Space Telescope has observed surface ice methanol — a key building block for organic compounds necessary for life, including sugars — on trans-Neptunian objects.

Harvard & Smithsonian have discovered a rare trans-Neptunian object, 2020 VN40, orbiting in perfect sync with Neptune.

Astronomers have found 2023 KQ14, nicknamed Ammonite, a rare sednoid with a unique orbit that challenges the Planet Nine ...

The long-serving space telescope saw the third interloper to enter the solar system from beyond its limits late on Monday ...

According to study co-author Dr Fumi Yoshida, Neptune is the only known massive object near the outer Solar System that could ...