Some astronomers believe the Sun may have formed with a twin billions of years ago. If true, the idea could help explain ...

The near-Earth asteroid Bennu contains stardust that is older than the solar system and clues about its violent history, ...

Tidal forces from Earth, Venus and Jupiter may help keep the sun calm, reducing the risk of powerful solar storms that ...

The solar system has many more moons than the one we can see in the sky. But how many do we actually know about? And how many ...

The new image, which shows Earth along with an even smaller point of light coming from the moon, harkens back to Carl Sagan's ...

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

The sun is unique in that it's the only star in our solar system. Up to 85% of stars have at least one companion star. The sun contains over 99% of the mass of our entire solar system.

This invisible boundary, located about 100 astronomical units (AU) from the Sun (one AU is the distance from Earth to the Sun ...

Comet 3I/ATLAS, the third known and fastest interstellar object to fly across the Solar System, is at it again. The latest ...

The OSIRIS-REx mission, which delivered over 120 grams (4.2 ounces) of Bennu ’s soil to Earth in 2023, is the largest haul of ...

As the Solar System drifts through the Milky Way, it occasionally encounters regions of space capable of reshaping Earth’s environment. Millions of years ago, one such passage may have dramatically ...

Only eight planets call our solar system home. Or there might still be nine if some astronomers are correct about an as-yet undiscovered large body out past Neptune.