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Marcus Chown - The Ascent of Gravity: The Quest to Understand the Force that Explains Everything

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Marcus Chown The Ascent of Gravity: The Quest to Understand the Force that Explains Everything
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Why the force that keeps our feet on the ground holds the key to understanding the nature of time and the origin of the universe.

Gravity is the weakest force in the everyday world yet it is the strongest force in the universe. It was the first force to be recognized and described yet it is the least understood. It is a force that keeps your feet on the ground yet no such force actually exists.
Gravity, to steal the words of Winston Churchill, is a riddle, wrapped in a mystery, inside an enigma. And penetrating that enigma promises to answer the biggest questions in science: what is space? What is time? What is the universe? And where did it all come from?
Award-winning writer Marcus Chown takes us on an unforgettable journey from the recognition of the force of gravity in 1666 to the discovery of gravitational waves in 2015. And, as we stand on the brink of a seismic revolution in our worldview, he brings us up to speed on the greatest challenge ever to confront physics.

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the ascent of gravity THE QUEST TO UNDERSTAND THE FORCE THAT EXPLAINS - photo 1

the ascent of
gravity

THE QUEST TO UNDERSTAND THE
FORCE THAT EXPLAINS EVERYTHING

MARCUS CHOWN

THE ASCENT OF GRAVITY Pegasus Books Ltd 148 West 37 th Street 13th Floor Now - photo 2

THE ASCENT OF GRAVITY

Pegasus Books. Ltd.
148 West 37 th Street, 13th Floor
Now York, NY 10018

Copyright 2017 by Marcus Chown

First Pegasus Books hardcover edition November 2017

All rights reserved. No part of this book may be reproduced in whole or
in part without written permission from the publisher, except by reviewers who
may quote brief excerpts in connection with a review in a newspaper, magazine,
or electronic publication; nor may any part of this book be reproduced, stored
in a retrieval system, or transmitted in any form or by any means
electronic, mechanical, photocopying, recording, or other,
without written permission from the publisher.

ISBN: 978-1-68177-537-1

ISBN: 978-1-68177-594-4 (e-book)

Dstributed by W.W.Norton & Company, Inc.

To Mike & Claire, Val & Pat, Maureen & Pete With love, Marcus

Its embarrassing that were in the twenty-first century and we dont even know what makes gravity work.

Woody Norris

My thanks to the following people who helped me directly, inspired me or simply encouraged me during the writing of this book: Karen, Bea Hemming, Felicity Bryan, Paul Murphy, Michele Topham, Manjit Kumar, Thomas Levenson, David Tong, Andy Hamilton, Lee Smolin, Nima Arkani-Hamed, John English, Tash Aw, Brian Clegg, Graham Farmelo, David Berman, Gennady Gorelik, Neil Turok, Neil Belton, Brian May, Julia Bateson, Nick Booth, Jonathon Tullett, Daniel Tullett, Jose Tate, Barbara Brighton-Pell, Patrick OHalloran, Sue Noyce, Graham Noyce, Brian Chilver, Pat Chilver, Jean Dyke, Amanda Capewell, Sam Capewell, Grace Capewell, Rob Capewell.

Six things you may not know about gravity

Gravity creates a force of attraction between you and the coins in your pocket and between you and a person passing you on the street

It is so weak that, if you hold your hand out, the gravity of the whole Earth cannot overcome the strength of your muscles

Despite its weakness, gravity is so irresistible on the large scale that it controls the evolution and fate of the entire Universe

Everyone thinks it sucks but in most of the Universe it blows

If it had not switched on after the big bang time would not have a direction

Only by figuring it out will we be able to answer the biggest question of all: Where did the Universe come from?

At Livingston in Louisiana and Hanford in Washington State there are 4-kilometre-long rulers made of laser light. At 05.51 Eastern Daylight Time on 14 September 2015, a shudder went through first the Livingston ruler, then 6.9 milliseconds later, the one at Hanford. It was the unmistakable calling card of a passing gravitational wave a ripple in the very fabric of spacetime predicted to exist by Einstein almost exactly 100 years ago.

In a galaxy far, far away, at a time when the Earth hosted nothing bigger than a simple bacterium, two monster black holes, locked in a death-spiral, swung around each other one last time. As they kissed and coalesced, three whole solar masses vanished, reappearing instantly as a tsunami of a warped space-time, which raced outwards at the speed of light. For an instant its power was fifty times greater than that of all the stars in the Universe put together.

The detection of gravitational waves by the twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) on 14 September 2015 was an epoch-making moment in the history of science. Imagine you have been deaf since birth, then, suddenly, overnight, you are able to hear. This is the way it is for physicists and astronomers. For all of history we have been able to see the Universe. Now, at last, we can hear it. Gravitational waves are the voice of space. It is not too much of an exaggeration to say that their detection is the most important development in astronomy since the invention of the telescope in 1608.

Gravitational waves confirm that space-time is a thing in its own right, which can quiver and shudder, sending undulations propagating outwards like ripples spreading on a pond. They are the ultimate proof of Einsteins contention that gravity is warped space-time. Whereas Newton imagined a force of gravity reaching out from the Sun and ensnaring the Earth like a piece of invisible elastic, Einstein recognised that the Sun creates a valley in space-time in its vicinity around which the Earth circles endlessly like a planet-sized roulette ball in an oversized roulette wheel.

Although Newtons theory of gravity was hugely successful, explaining the motion of the planets and the ocean tides and even predicting the existence of an unknown world Neptune Einsteins theory of gravity was just as successful, explaining the anomalous motion of Mercury and predicting the existence of black holes and the big bang in which the Universe was born. But Einsteins theory of gravity, like Newtons before it, contains the seeds of its own destruction. At the hearts of black holes and at the birth of the Universe, it predicts the existence of nonsensical singularities where the parameters of physics skyrocket to infinity.

The irony is that the first force to be described by science and the one everyone thinks was understood long ago is actually the least understood. Gravity, to steal the words of Winston Churchill, is a riddle, wrapped in a mystery, inside an enigma.

Now, at the outset of the twenty-first century, we stand on the verge of a new revolution. The search for a deeper theory than Einsteins a quantum theory of gravity is the greatest endeavour ever embarked upon by physics. Already, there are tantalising glimpses of a new world view. Perhaps another Newton or Einstein is at this moment waiting in the wings, assembling the fragmentary pieces of the puzzle into a coherent whole. Or perhaps a more likely scenario it will take the efforts of dozens of people working in concert. Many physicists believe we are on the verge of a seismic shift in our view of reality, one more far-reaching in its consequences than any that has gone before.

Will the deeper theory than Einsteins give us warp drives and time machines, the ability to manipulate space and access parallel universes? No one can predict, just as no one in the preelectrical era could have predicted televisions and mobile phones and the World Wide Web. What we do know is that when at last we have the elusive theory in our possession, we will be able to answer the biggest scientific questions of all. What is space? What is time? What is the Universe? And where did it come from?

But I am getting ahead of myself. How did we get to where we are today, standing on the brink of a vast undiscovered landscape of physics? The story began with a twenty-two-year-old named Isaac Newton in the plague year of 1666...

A word on endnotes, which readers will find after the final chapter of the book: some contain asides that, if included in the text, would have broken its flow. Some amplify the explanations in the text, occasionally using technical language. And some are references to books and articles, where you can find out more information about the subject in the text.

For in those days I was in the prime of my age for invention and minded Mathematicks & Philosophy more than at any time since.

Isaac Newton

You fainted and I caught you. It was the first time Id supported a human. You had such heavy bones. I put myself between you and gravity. Impossible.

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