Readers will learn all about asteroids and comets. Learn about what is inside these large space lumps, where they come from, and different asteroids and comets throughout history.

Top secret : for your eyes only! -- Asteroids : the basics -- Comets : the basics -- Rocky belts, rings, and clouds -- Comet fact files -- Tunguska event -- Asteroid vs Earth -- Surviving an asteroid impact -- The Torino scale -- Protecting Earth from asteroids -- Asteroid mining -- Living on an asteroid -- Catching a near-Earth object.