An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

Stargazers will be treated to a dazzling six-planet "alignment" this January.

"Across the universe we’re adding billions of new solar systems and trillions ... Many of the new planets have a "new terrain system" and that allows for truly towering mountains and even ...

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

Jan. 15, 2025 — New observational data and simulation models have confirmed a new type of planet unlike anything found in the Solar System. This provides another piece of the puzzle to ...

An object we thought belonged to the most common category of planet in the galaxy has turned out to be something we've never seen ... because we have nothing directly analogous to them here in our ...

A new study suggests that a planet-sized object may have passed through the solar system billions of years ago.

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...