This books explains about Asteroids, Meteoroids, Comets and Meteor Showers. The colorful pictures in the book will create the interest of Children in the Asteroids study. This book is for teens who like to read SPACE SCIENCE. Many of us heard news like ‘Giant potentially hazardous asteroid flew safely by the Earth last month’. The question arises in our mind- ‘What is an asteroid’? Why it is necessary to study it? According to some scientists, an asteroid collision may be the biggest threat to the planet. We all know that millions of years ago, asteroids hit the Earth and made all dinosaurs disappear. A collision 66 million years ago between The Earth and an object (which was approximately 10 Kilometers wide) is thought to have produced the extinction event for dinosaurs. This event is widely held responsible for the extinction of most of dinosaurs. Asteroids are ‘minor planets’ as they are much smaller in size than planets. They are usually found in the inner solar systems. It is small and rock like objects that orbit the Sun. Asteroids are made from different kinds of rocks and metals, with the metal being mostly the Nickel and Iron. Asteroids don’t have an atmosphere.