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

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

The star is surrounded by a protoplanetary disk, and this disk is the first evidence of debris condensing into what will ...

Watch interstellar comet 3I/ATLAS live online tonight as it races toward the sun on a rare visit from beyond our solar system.

CAPE CANAVERAL, Fla. (AP) — Astronomers are monitoring an object headed our way that may have wandered over from another star system.

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new simulations show.

This artist’s concept depicts one of the solar system’s inner planets slamming into Earth after being nudged on a collision course by a passing star. Such a world-shattering cataclysm is ...

Slotkin on Democratic divisions: 'We're like a solar system with no sun' The first-term senator said internal disagreements are splitting the party.

In this artist’s impression, a comet erupts with jets of gas as it falls toward the sun from the depths of the outer solar system.

New research says that Earth could be ejected from our solar system if a passing star was to come close enough.

This Powerful Telescope Quickly Found 2,100 New Asteroids The Vera C. Rubin Observatory is expected to find millions of unknown objects in our solar system, and perhaps even a mysterious Planet Nine.

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar system. Now, a team of researchers have taken a completely different ...