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Given the fact that there are perhaps 400 billion stars in our galaxy alone and perhaps 400 billion galaxies in the universe, it stands to reason that somewhere out there, in the 14-billion-year-old cosmos, there is or once was a civilization at least as advanced as our own. The sheer enormity of the numbers almost demands that we accept the truth of this hypothesis. Why, then, have we encountered no evidence, no messages, no artifacts of these extraterrestrials?

Why is the fine-structure constant approximately one over one hundred and thirty-seven? Why is the proton exactly 1836 times heavier than the electron? Why is gravity so absurdly weak compared to the other forces? For more than a century, physicists have measured the fundamental constants of nature with exquisite precision—yet no one can explain why they have the values they do. Three answers have been proposed. The constants are brute accidents with no deeper explanation. They will one day be derived from a final theory.

Unearth the hidden past of Earth and its intricate connection with our galaxy's undisclosed history in this engaging new volume. Presenting a unique blend of scientific evidence, philosophical thought, and spiritual insight, this book unifies these seemingly disparate realms into a coherent narrative. Delve into the profound origins of our species and our celestial lineage, linked to infinite worlds, alternate dimensions, and numerous universes.

This new and long-awaited sequel to Carl Sagan's international best seller continues the electrifying journey through space and time, linking worlds within and worlds billions of miles away and envisioning a future of science tempered with wisdom. Based on National Geographic's internationally-renowned television series, this groundbreaking and visually stunning book explores how science and civilization grew up together.

Does time exist? What is infinity? Why do mirrors reverse left and right but not up and down? In this scintillating collection, Holt explores the human mind, the cosmos, and the thinkers who’ve tried to encompass the latter with the former. With his trademark clarity and humor, Holt probes the mysteries of quantum mechanics, the quest for the foundations of mathematics, and the nature of logic and truth. Along the way, he offers intimate biographical sketches of celebrated and neglected thinkers, from the physicist Emmy Noether to the computing pioneer Alan Turing and the discoverer of fractals, Benoit Mandelbrot.

Einstein's theory of gravity, as beautiful as it is, seems to be in direct contradiction with another theory he helped create: quantum mechanics. From the explosions of neutron stars and the collisions of black holes to the modern scientific process as a means to seek truth and understanding in the cosmos, this audiobook takes the listener on a journey of learning and discovery that has been 100 years in the making.

An intriguing new scientific theory that explains what life is and how it emerges. What is life? This is among the most difficult open problems in science, right up there with the nature of consciousness and the existence of matter. All the definitions we have fall short. None help us understand...

In Cosmos, the late astronomer Carl Sagan cast his gaze over the magnificent mystery of the Universe and made it accessible to millions of people around the world. Now in this stunning sequel, Carl Sagan completes his revolutionary journey through space and time.

A NEW YORK TIMES NOTABLE BOOK * AN NPR SCIENCE FRIDAY BOOK CLUB SELECTION * NAMED A BEST BOOK OF THE YEAR BY THE WASHINGTON POST, THE ECONOMIST, NEW SCIENTIST, PUBLISHERS WEEKLY, and THE GUARDIAN From the cohost of the podcast The Universe with John Green and one of the most dynamic stars in...

Who are we, and how did we get here? These are two of the most fundamental and far-reaching questions facing scientists and cosmologists alike and have rested at the center of human intellectual endeavor since its beginning. They are questions that stretch across numerous disciplines. Philosophy, theology, evolutionary biology, and mathematics are just some of the fields looking to explain the emergence of human life.

Once dismissed as a mathematical curiosity, black holes are so strange they almost defy belief. Since their existence was confirmed, research into the nature of black holes has opened up new vistas in physics. In this audiobook, we examine some of the most fascinating discoveries about black hole formation and behavior, the new and evolving research in gravitational wave astronomy, theoretical possibilities such as wormholes, and much more.

This classic in the field of ufology is filled with hard-hitting eyewitness testimony of one of the most important events of all time: the actual recovery of a UFO outside of Roswell, New Mexico, in 1947. For more than seventy years, government authorities have led us to believe the wreckage was merely a very conventional weather balloon - but the witnesses who were there continue to tell a different story. Witness to Roswell once again provides a "can't put down" written account of what really transpired in Roswell decades ago. 

*An instant New York Times Bestseller* *Publishers Weekly #1 Most Anticipated Science Book of Spring 2016* "You will be enthralled." — Wall Street Journal "A tour de force." — Salon.com Already internationally acclaimed for his elegant, lucid writing on the most challenging notions in modern...

In this companion volume to Merlin’s Tour of the Universe, we visit again with Merlin, a timeless traveler from Planet Omniscia, who answers a collection of imaginative questions about the cosmos from curious stargazers. Whether waxing poetic about Earth and its environs, the Sun and its stellar siblings, physical laws, or galaxies near and far, Merlin’s remarks are witty, humorous, and clear as a starry night sky.

From Brian Greene, one of the world's leading physicists, comes a grand tour of the universe that makes us look at reality in a completely different way. Space and time form the very fabric of the cosmos. Yet they remain among the most mysterious of concepts. Is space an entity? Why does time...

NEW YORK TIMES BEST SELLER A captivating exploration of deep time and humanity's search for purpose from the world-renowned physicist and best-selling author of The Elegant Universe "Few humans share Greene’s mastery of both the latest cosmological science and English prose." —The New...

Brought to you by Penguin. From the world-renowned physicist and best-selling author of The Elegant Universe comes this captivating exploration of deep time and humanity's search for purpose In both time and space, the cosmos is astoundingly vast, and yet is governed by simple, elegant...

This audio edition is narrated with dazzling enthusiasm by the author, Dr Becky Smethurst. Right now, you are orbiting a black hole. The Earth orbits the Sun, and the Sun orbits the centre of the Milky Way: a supermassive black hole, the strangest and most misunderstood phenomenon in the galaxy...

Sometimes our understanding of our universe is given a huge boost by one insightful thinker. Such a boost came in the first half of the 20th century, when an obscure Belgian priest put his mind to deciphering the nature of the cosmos. The Day Without Yesterday covers the modern history of an evolving universe, and how Georges Lemaître convinced a generation of thinkers to embrace the notion of cosmic expansion and the theory that this expansion could be traced backward to the cosmic origins, a starting point for space and time that Lemaître called "the day without yesterday".

In virtually all fields of human endeavor, Classical Athens was so much at the forefront of dynamism and innovation that the products of its most brilliant minds remain not only influential but still relevant to this day. To the ancient Greeks, the cosmos was ordered and harmonious. Consequently, reason and intellect were considered the architects of all art and craftsmanship. The absolute perfection of form was sought in everything and the Greek passion for simplicity, elegance, harmony, and beauty is to be found everywhere, particularly in architecture.