Over millions of years, these objects grew larger, sweeping up material in their orbits and becoming the planets we know today. This model of solar system formation is known as the nebular hypothesis.

Stars that pass close to the solar system could pull planets out of alignment, sending them hurtling into the sun or out into ...

TRI-CITIES, Wash., - A new educational project is set to transform the trails along the Columbia River into a scale model of ...

Webb Telescope Captures Its First Direct Images of Carbon Dioxide Outside Solar System Mar ... a compelling new model for the formation of super-Earths and mini-Neptunes -- planets that are ...

Artificial intelligence is transforming the search for alien life with new tools that detect UAPs and identify Earth-like exoplanets across the galaxy.

The mystery of how planets and icy objects formed in the farthest reaches of our solar system just took an exciting turn. A ...

The best telescopes for seeing planets are perfect for getting the ... If you'd prefer to gaze beyond our solar system, we've selected the best telescopes for deep space. Or if you're looking ...

This week, an old astronomical controversy is renewed as researchers present new evidence for a hidden "Planet X" in our solar system.

Billions of years ago, in the frozen edges of the solar system, a violent impact shaped one of space’s oddest pairs. Instead ...