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All the stars, planets, galaxies and other visible objects make up only about 4 percent of our universe. The other 96 percent is made of invisible stuff. We cannot see or detect them but know about their existence. This invisible area of the universe is explained in this book. This book will give you a transparent idea and knowledge about this deep part of our universe. The subject matter is presented in a simple way, step by step with sufficient illustrations. This book may be of interest to students, teachers, as well as general readers who are interested in astronomy.