Black holes have turned out to be the cornerstone of both physics and popular belief. But what if we were to realize that exact black holes cannot exist, even though their existence is apparently suggested by exact general relativistic solutions, and Roger Penrose won the 2020 Nobel Prize in Physics ‘for the discovery that black hole formation is a robust prediction of the general theory of relativity’? While it might seem far-fetched to claim so, it will be worth remembering that the finest theoretical physicists like Albert Einstein and Paul Dirac did not believe in black holes, and Stephen Hawking finally thought that there are no exact black holes. While the black hole paradigm has become commonplace in popular consciousness, in the last decade, noise has consistently grown about the many physical effects which can inhibit the formation of exact mathematical black holes. In The Rise and Fall of the Black Hole Paradigm, Abhas Mitra shows us how, much before these developments, he had proven why the so-called black holes must only be black hole pretenders. He identified these black hole candidates to be Magnetospheric Eternally Collapsing Objects (MECOs) and, along with Darryl J. Leiter and Stanley L. Robertson, generalized them. Recent evidence for the existence of strong magnetic fields around so-called black holes may provide confirmations of his claim.
Did you know that energy consumption by humans has increased by at least 30,000 times in the last 5000 years? In Delhi alone, there are over 80,000 trucks that run on the city roads every night. They emit un-burnt fossil fuels from their exhausts. Isn’t it terrifying that over 1 million seabirds and 100,000 sea mammals are killed by pollution every year? Why Should I Save Energy? is a comprehensive book that will introduce children to different forms of energy, history of fossil fuels, great scientists and their inventions, and more importantly, to the problems our planet faces with depletion of natural resources. Filled with eye-opening facts, beautiful pictures, multiple activities, and a quiz that helps reinforce learning; this book is the perfect guide to help you become an energy saver. Table of Contents • Energy Here, Today, Tomorrow, and Forever • Made Yesterday, Here Today, Gone Tomorrow? • Effects of Pollution on Our Environment • History of Fossil Fuels • Save Energy, Save the Future • Smog • Climate Change Calamity • The Planet Needs You To Change • Recycling to Save Energy • Exploring Alternate Renewable Sources of Energy • Activity 1 • Activity 2 • Activity 3 • Quiz • Glossary Other books in this series: Why Should I Eat Healthy: A-Z of Food and Nutrition Guide (ISBN: 9789386530035) Why Should I Protect Nature?: A smart kid’s guide to a green world (ISBN: 9788179936627) Why Should I Recycle? (A Smart kid's guide to a green world) (ISBN: 9788179934500) Why Should I Save Water? (A Smart kid's guide to a green world) (ISBN: 9788179933695)
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