This book is intended as a reference book for students in Physics, Chemistry and Engineering Field.The present book, ¿Astrophysics¿ is a branch of space science that applies the laws of physics and chemistry to seek to understand the universe and our place in it. The field explores topics such as the birth, life and death of stars, planets, galaxies, nebulae and other objects in the universe.We are thankful to god & our parents. We also give great thanks to our institution for their full support to publish this book.