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Neil Degrasse Tyson - Welcome to the Universe: An Astrophysical Tour

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Neil Degrasse Tyson Welcome to the Universe: An Astrophysical Tour

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A NEW YORK TIMES BESTSELLER

Welcome to the Universe is a personal guided tour of the cosmos by three of todays leading astrophysicists. Inspired by the enormously popular introductory astronomy course that Neil deGrasse Tyson, Michael A. Strauss, and J. Richard Gott taught together at Princeton, this book covers it allfrom planets, stars, and galaxies to black holes, wormholes, and time travel.

Describing the latest discoveries in astrophysics, the informative and entertaining narrative propels you from our home solar system to the outermost frontiers of space. How do stars live and die? Why did Pluto lose its planetary status? What are the prospects of intelligent life elsewhere in the universe? How did the universe begin? Why is it expanding and why is its expansion accelerating? Is our universe alone or part of an infinite multiverse? Answering these and many other questions, the authors open your eyes to the wonders of the cosmos, sharing their knowledge of how the universe works.

Breathtaking in scope and stunningly illustrated throughout, Welcome to the Universe is for those who hunger for insights into our evolving universe that only world-class astrophysicists can provide.

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Copyright 2016 by Neil deGrasse Tyson Michael A Strauss and J Richard Gott - photo 1

Copyright 2016 by Neil deGrasse Tyson Michael A Strauss and J Richard Gott - photo 2

Copyright 2016 by Neil deGrasse Tyson, Michael A. Strauss, and J. Richard Gott

Requests for permission to reproduce material from this work
should be sent to Permissions, Princeton University Press

Published by Princeton University Press
41 William Street, Princeton, New Jersey 08540

In the United Kingdom: Princeton University Press
6 Oxford Street, Woodstock, Oxfordshire OX20 1TR

press.princeton.edu

Jacket and book design by Chris Ferrante

All Rights Reserved

Library of Congress Cataloging-in-Publication Data

Names: Tyson, Neil deGrasse. | Strauss, Michael Abram. | Gott, J. Richard.Title: Welcome to the universe : an astrophysical tour / Neil deGrasse Tyson, Michael A. Strauss, and J. Richard Gott.
Description: Princeton : Princeton University Press, 2016. | Includes bibliographical references and index.

Identifiers: LCCN 2016013487 | ISBN 9780691157245 (hardback : alk. paper)

Subjects: LCSH: CosmologyPopular works. | StarsPopular works. | Relativity (Physics)Popular works.
Classification: LCC QB982 .T974 2016 | DDC 523.1dc23 LC record available at
https://lccn.loc.gov/2016013487

British Library Cataloging-in-Publication Data is available

This book has been composed in Adobe Text Pro and Trade Gothic LT Std

Printed on acid-free paper.

Printed in the United States of America

10 9 8 7 6 5 4 3 2 1

To the memories of Lyman Spitzer, Jr., Martin Schwarzschild,
Bohdan Paczyski, and John Bahcall, indelible influences on
the three of us in astrophysics research and education.

PREFACE

When my granddaughter Allison was born, one of the first things I said to her was Welcome to the universe! Its something my coauthor Neil Tyson has said many times on radio and TV. Indeed it is one of Neils signature sayings. When you are born, you become a citizen of the universe. It behooves you to look around and get curious about your surroundings.

Neil felt a call from the universe on a first visit to the Hayden Planetarium in New York City when he was 9 years old. As a city kid, he saw the glories of the nighttime sky for the first time displayed on the planetarium dome and decided at that moment to become an astronomer. Today he is the director of that institution.

In fact, we are all touched by the universe. The hydrogen in your body was forged in the birth of the universe itself, while the other elements in your body were made in distant, long-dead stars. When you call a friend on your mobile phone, you should thank astronomers. Mobile phone technology depends on Maxwells equations, whose verification depended on the fact that astronomers had already measured the speed of light. The GPS that tells your phone where you are and helps you navigate relies on Einsteins theory of general relativity, which was verified by astronomers measuring the deflection of starlight passing near the Sun. Did you know there is an ultimate limit to how much information can ever be stored in a 6-inch-diameter hard drive and that it depends on black hole physics? At a more mundane level, the seasons you experience every year depend directly on the tilt of Earths axis relative to the plane of its orbit around the Sun.

This book aims to better acquaint you with the universe in which you live. The idea for this book started when the three of us taught a new undergraduate course on the universe for nonscience majors at Princeton Universityfor students who perhaps had never taken a science course before. For this purpose, Neta Bahcall, our colleague and director of undergraduate studies, selected Neil deGrasse Tyson, Michael Strauss, and me. Neils genius at explaining science to nonscientists was apparent, Michael had just discovered the most distant quasar yet found in the universe, and I had just received the universitys Presidents Award for Distinguished Teaching. The course was launched with great fanfare and attracted so many students that we couldnt hold it in our own building and had to move it to the biggest lecture hall in the Physics Department. Neil talked about Stars and Planets, Michael talked about Galaxies and Quasars, and I talked about Einstein, Relativity, and Cosmology. The course was mentioned in Time magazine, when Time honored Neil as one of the 100 most influential people in the world in 2007. Among other features of this book, you will get to know Neil as a professor, telling you things he tells his students.

FIGURE 01 The three authors left to right Strauss Gott and Tyson Photo - photo 3

FIGURE 0.1. The three authors, left to right: Strauss, Gott, and Tyson.

Photo credit: Princeton, Denise Applewhite

After we had taught the course for a number of years, we decided to put its ideas down in the form of a book for readers who hungered for a deeper understanding of the universe.

We give you a tour of the universe from an astrophysical point of view, from the point of view of trying to understand what is going on. We tell you how Newton and Einstein got their greatest ideas. You know Stephen Hawking is famous. But we tell you what made him famous. The great movie of his life story, The Theory of Everything, won Eddie Redmayne a best actor Oscar for his compelling portrayal of Hawking. It shows Hawking having his greatest idea by simply staring into the fireplace and having it suddenly come to him. We tell you what the movie left out: how Hawking didnt believe the work of Jacob Bekenstein, but he ended up reaffirming it and taking it to an entirely new conclusion. And thats the same Jacob Bekenstein who found the ultimate limit for how much information could be stored on your 6-inch-diameter hard drive. Its all connected. In this book, of all the topics in the universe, we focus particularly on those we are most passionate about, and we hope our excitement will be contagious.

Much has been added to astronomical knowledge since we began, and this book reflects that. Neils views on the status of Pluto have been ratified by the International Astronomical Union, in a historic vote in 2006. Thousands of new planets have been discovered circling other stars. We discuss them. The standard cosmological model, including normal atomic nuclei, dark matter, and dark energy, is now known with exquisite accuracy, thanks to results from the Hubble Space Telescope, the Sloan Digital Sky Survey, and the Wilkinson Microwave Anisotropy Probe (WMAP) and Planck satellites. Physicists have discovered the Higgs Boson at the Large Hadron Collider in Europe, bringing us one step closer to the hoped for theory of everything. The Laser Interferometer Gravitational-Wave Observatory (LIGO) experiment has made a direct detection of gravitational waves from two inspiraling black holes.

We explain how astronomers have determined how much dark matter there is, and how we know that it is not made of ordinary matter (with atomic nuclei containing protons and neutrons). We explain how we know the density of dark energy, and how we know that it has a negative pressure. We cover current speculations on the origin of the universe and on its future evolution. These questions bring us to the frontiers of physics knowledge today. We have included spectacular images from the Hubble Space Telescope, the WMAP satellite, and the New Horizons spacecraftshowing Pluto and its moon Charon.

The universe is awesome. Neil shows you that in the very first chapter. This leaves many people thrilled, but feeling tiny and insignificant at the same time. But our aim is to empower you to understand the universe. That should make you feel strong. We have learned how gravity works, how stars evolve, and just how old the universe is. These are triumphs of human thought and observationthings that should make you proud to be a member of the human race.

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