All the stars, planets, galaxies and other visible objects make up only about four percent of our universe. The other ninety-six 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 (without a science background) who are interested in astronomy. 

 PUBLICATION 

Publication Date: March 14, 2020

Publishers: Notionpress (India) (Paperback)

                       Amazon KDP (Abroad) (Kindle and Paperback) 

ISBN 13: 978-93-5391-779-1 (Paperback)

ASIN: B084ZRBVPD (Kindle EBook)

GGKEY: DL3YTP37QH1 E (Google Play EBook)

 CONTENTS 

Preface 

Foreword

Acknowledgement

Chapter 1: Nature of light 

Chapter 2: Theory of Relativity 

Chapter 3: Space and Time or Space-time? 

Chapter 4: Gravity

Effect of gravity on Space-time and light 

Gravitational lensing

Gravitational waves

Chapter 5: Black hole

Structure of Black hole 

Derivation of Schwarzschild Radius

Formation of Black holes

Chandrasekhar limit

Gravitational time dilation

Journey into a Black hole

Hawking radiation

Detection of Black holes

Chapter 6: Photography of the invisible

Very Long Baseline Interferometry (VLBI) 

Event Horizon Telescope 

Chapter 7: The reverse Black hole - White hole

The idea of Worm hole

Chapter 8: Dark matter 

Chapter 9: Doppler Effect 

Chapter 10: Hubble’s law 

Age of the Universe from Hubble’s Constant

Chapter 11: Cosmological constant and Dark Energy 

Chapter 12: The Destiny

Appendix

Appendix 1: Michelson-Morley experiment

Appendix 2: Relativistic Doppler effect derivation

Appendix 3: Particle Physics in brief

Appendix 4: Euclidean and non- Euclidean geometry 

Appendix 5: WMAP 

Appendix 6: Symbols used in this book

Bibliography

Index