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

The Subaru Telescope has revealed a fourth member of the sednoids, a group of small bodies with peculiar orbits around the ...

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

While astronomers have previously seen young discs that contain newborn, massive, Jupiter-like planets, McClure says, “we’ve always known that the first solid parts of planets, or planetesimals, must ...

Researchers suspect that two meteorites found in the Sahara Desert in 2023 may originally have come from Mercury, which would ...

A groundbreaking study published in Communications Earth & Environment has called into question the long-standing assumptions ...

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

“It’s the most massive [merger] so far,” says Mark Hannam, a physicist at Cardiff University, UK, and part of the LVK ...

Rocky bodies called protoplanets were thought to have formed slightly earlier in the inner solar system than those beyond the asteroid belt, but now a meteorite from the outer solar system is rewritin ...

Though our solar system and the movement of its planets appear relatively sedate, there are many things that could upset the ...

Astronomers have discovered yet another alien visitor to the Solar System.