On a dark night as you watch the sky with your friends, a rock with a fiery tail shoots across the sky. A comet! Asteroids and comets hurtle through space, some

Have you ever wished on a shooting star? Shooting stars often appear when the earth passes through the dust and debris left by a passing comet. Explore Comets a

With a fiery red explosion, a volcano becomes a disaster in the blink of an eye. Lava and ash shower down, covering the landscape for miles. Starting with molte

An insider's look at the science of near-Earth comets and asteroids Of all the natural disasters that could befall us, only an Earth impact by a large comet or

The world’s leading textbook on astrobiology—ideal for an introductory one-semester course and now fully revised and updated Are we alone in the cosmos? How