Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

The discovery of a planet that is far too massive for its sun is calling into question what was previously understood about the formation of planets and their solar systems.

For the first time, astronomers spot the beginning of a solar system The discovery is like finding a solar system's 'baby picture.' Laura Baisas Jul 16, 2025 11:00 AM EDT ...

NEW YORK — Scientists have unlocked one of the solar system’s many secrets from an unexpected source: a planetarium show that opened to the public on June 2.

Astronomers may have detected a dozen large objects lurking beyond the Kuiper Belt at the edge of our solar system, suggesting there could be another equally massive, "second Kuiper Belt" hiding ...

A tiny meteorite is rewriting what scientists thought they knew about the origins of our solar system.