Space Rocks

What space rocks can teach us about the solar system

Asteroids and comets hold clues to Solar System formation, and even the evolution of life itself.

A billion asteroids twirl around the Solar System along with the planets and moons.

Shutterstock

Shutterstock

These space rocks can measure as much as 330 miles across (Vesta, the largest asteroid), or shorter than a school bus. And scientists are extremely interested in these airless, rocky objects.