A long-lost planet that helped create the Moon may have formed much closer to the Sun than scientists once thought, according to new research. Scientists have discovered that Theia, the ancient planet ...

A Southwest Research Institute-led study has proposed a connection between a specific collision in the main asteroid belt and ...

A catastrophic asteroid breakup may have triggered a huge wave of impacts across the inner solar system about 800 million ...

Rogue planets sound like rare travelers among the stars, freed from the gravitational constraints of a host system, left to forever wander the interstellar void. But modern models suggest these free ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Astronomers have found a distant celestial body — ...