A stronomers have discovered an incredibly rare non-planetary body lurking on the outer reaches of the Solar System, which ...

Trans-Neptunian objects (TNO) are some of our solar system's lesser-known objects. They number in the thousands, and they get ...

Astronomers have discovered a bizarre object in the outer solar system, 2020 VN40, that dances to Neptune’s gravitational ...

"This is a big step in understanding the outer solar system," team leader Rosemary Pike from the Center for Astrophysics | ...

New evidence suggests that billions of years ago, a star may have passed very close to our solar system. As a result, ...

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

Despite the powerful telescopes that modern astronomers have to work with, the distant reaches of the Solar System are still ...

Our solar system has a mysterious new object! Trans-Neptunian body takes nearly 300 years to travel around the sun - and could help in the search for Planet Nine, astronomers say.

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

In addition to the newly reported trans-Neptunian objects, Sheppard and Trujillo also discovered another in 2014, which they nicknamed "Biden," after the American Vice President.

The trans-Neptunian object Arrokoth, also known as Ultima Thule, which NASA's space probe New Horizons passed on New Year's Day 2019, may have changed its shape significantly in the first 100 ...