Asteroids are rocky objects that orbit the Sun, just like planets do. There are millions of asteroids of very different shapes and sizes. Some are almost spheres, like planets, but most are ...

Astronomers have discovered an Earth-size planet that is showered with so much radiation, its atmosphere eroded away long ago ...

Earth grew to its final size through one last major collision with another Mars-sized object ... Different types of meteorites coming from the asteroids left over in the solar system after planet ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

Continent-size islands deep inside Earth's mantle could ... 100 earthquakes strong enough to reverberate through the whole planet, including the LLSVPs and the surrounding mantle.