The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.

From the cratered companion that lights Earth's night sky to the hundreds of icy worlds circling the Solar System's giant ...

A rare meteorite has revealed evidence of a massive lost world that once orbited the young Sun before being destroyed in a catastrophic collision. The discovery suggests some early planets formed from ...

This summer, scientists spotted an incredibly rare visitor to Earth’s solar system—a comet, now known as 3I/ATLAS, that entered our solar system from the galaxy beyond and is zipping past the sun at a ...

Solar system terrestrial planets as a research area focuses on the comparative study of Mercury, Venus, Earth, and Mars to understand the formation, differentiation, and evolution of rocky planets. It ...

Discover how a Sahara Desert meteorite reveals secrets of a vanished Mars-sized planet, reshaping our understanding of early ...