Here, for the first time, is the complete history of the quest to understand Earth’s magnetism—from the ancient Greeks’ fascination with lodestone, to the geological discovery that the North Pole has not always been in the North—and to the astonishing modern conclusions that finally revealed the true source.Richly illustrated and skillfully told, North Pole, South Pole unfolds the human story behind the science: that of the inquisitive, persevering, and often dissenting thinkers who unlocked the secrets at our planet’s core.

    Every massive star leaves behind a black hole when it dies, and every galaxy harbors a supermassive black hole at its center. Frighteningly enigmatic, these dark giants continue to astound even the scientists who spend their careers studying them. Which came first, the galaxy or its central black hole? What happens if you travel into one—instant death or something weirder? And, perhaps most important, how can we ever know anything for sure about black holes when they destroy information by their very nature?In Einstein’s Monsters, distinguished astronomer Chris Impey takes readers on an exploration of these and other questions at the cutting edge of astrophysics, as well as the history of black holes’ role in theoretical physics—from confirming Einstein’s equations for general relativity to testing string theory. He blends this history with a poignant account of the phenomena scientists have witnessed while observing black holes: stars swarming like bees around the center of our galaxy; black holes performing gravitational waltzes with visible stars; the cymbal clash of two black holes colliding, releasing ripples in space-time.Clear, compelling, and profound, Einstein’s Monsters reveals how our comprehension of black holes is intrinsically linked to how we make sense of the universe and our place within it. From the small questions to the big ones—from the tiniest particles to the nature of space-time itself—black holes might be the key to a deeper understanding of the cosmos.

    Yet most of us look up at the night sky and feel totally in the dark when it comes to the basic facts about the universe.Kenneth C. Davis steps into that void with a lively and readable guide to the discoveries, theories, and real people who have shed light on the mysteries and wonders of the cosmos. Discover why Einstein was such a genius, the truth behind a blue moon or two, the amazing secrets of Stonehenge, and even how one great astronomer lost his nose.With the fun question-and-answer format that has appealed to the millions of readers of his bestselling Don't Much About® series, you'll be taking off on an exciting armchair exploration of the solar system, the Milky Way, and beyond.

    Beneath the frozen crusts of several of the small, ice-covered moons of Jupiter and Saturn lurk vast oceans that may have been in existence for as long as Earth, and together may contain more than fifty times its total volume of liquid water. Could there be organisms living in their depths? Alien Oceans reveals the science behind the thrilling quest to find out.Kevin Peter Hand is one of today's leading NASA scientists, and his pioneering research has taken him on expeditions around the world. In this captivating account of scientific discovery, he brings together insights from planetary science, biology, and the adventures of scientists like himself to explain how we know that oceans exist within moons of the outer solar system, like Europa, Titan, and Enceladus. He shows how the exploration of Earth's oceans is informing our understanding of the potential habitability of these icy moons, and draws lessons from what we have learned about the origins of life on our own planet to consider how life could arise on these distant worlds.Alien Oceans describes what lies ahead in our search for life in our solar system and beyond, setting the stage for the transformative discoveries that may await us.

    Coated in red dust, the terrain is bewilderingly empty. And yet multiple spacecraft are circling Mars, sweeping over Terra Sabaea, Syrtis Major, the dunes of Elysium, and Mare Sirenum—on the brink, perhaps, of a staggering find, one that would inspire humankind as much as any discovery in the history of modern science.In this beautifully observed, deeply personal book, Georgetown scientist Sarah Stewart Johnson tells the story of how she and other researchers have scoured Mars for signs of life, transforming the planet from a distant point of light into a world of its own.Johnson’s fascination with Mars began as a child in Kentucky, turning over rocks with her father and looking at planets in the night sky. She now conducts fieldwork in some of Earth’s most hostile environments, such as the Dry Valleys of Antarctica and the salt flats of Western Australia, developing methods for detecting life on other worlds. Here, with poetic precision, she interlaces her own personal journey—as a female scientist and a mother—with tales of other seekers, from Percival Lowell, who was convinced that a utopian society existed on Mars, to Audouin Dollfus, who tried to carry out astronomical observations from a stratospheric balloon. In the process, she shows how the story of Mars is also a story about Earth: This other world has been our mirror, our foil, a telltale reflection of our own anxieties and yearnings.Empathetic and evocative, The Sirens of Mars offers an unlikely natural history of a place where no human has ever set foot, while providing a vivid portrait of our quest to defy our isolation in the cosmos.

    We just want to lie down, look up, and understand the heavens above. The National Geographic Backyard Guide to the Night Sky shows us how.Authors Howard Schneider and Patricia Daniels take an expert but easygoing approach that doesn’t overwhelm—it invites. Ten chapters cover everything a beginning stargazer will need to know, from understanding the phases of the moon to picking Mars out of a planetary lineup to identifying the kinds of stars twinkling in the constellations.Throughout the book, star charts and tables present key facts in an easy-to-understand format, sidebars and fact boxes present illuminating anecdotes and fun facts to sweep us swiftly into the stardust, and by the time we realize we’ve been schooled in solid science we’re too engrossed to object.Along with practical advice and hands-on tips to improve observation techniques, the guide includes an appendix full of resources—from books and web sites to lists of astronomy clubs and associations to local planetariums and museums. This indispensable book guides us on a new path into the night sky, truly one of the greatest shows on Earth.

    A riveting account of three heroic astronauts who took one of the most dangerous space flights ever, from the New York Times bestselling author of Shadow Divers. In early 1968, the Apollo program was on shaky footing. President Kennedy's end-of-decade deadline to put a man on the Moon was in jeopardy, and the Soviets were threatening to pull ahead in the space race. By August 1968, with its back against the wall, NASA decided to scrap its usual methodical approach and shoot for the heavens. With just four months to prepare--a fraction of the normal time--the agency would send the first men in history to the Moon. In a year of historic violence and discord--the Tet offensive, the assassinations of MLK and RFK, the Chicago DNC riots--the Apollo 8 mission was the boldest test of what America could do. With a focus on astronauts Frank Borman, Jim Lovell, and Bill Anders, and their wives and children, this is a vivid, gripping, you-are-there narrative that shows anew the epic danger involved, and the singular bravery it took, for man to leave Earth for the first time--and to arrive at a new world.

    It sounds like a lot, but Earth’s atmosphere is smeared onto its surface in an alarmingly thin layer — 99 percent contained within eighteen miles. Yet within this fragile margin lies a magnificent realm — at once gorgeous, terrifying, capricious, and elusive. With his keen eye for identifying and uniting seemingly unrelated events, Chris Dewdney reveals to us the invisible rivers in the sky that affect how our weather works and the structure of clouds and storms and seasons, the rollercoaster of climate. Dewdney details the history of weather forecasting and introduces us to the eccentric and determined pioneers of science and observation whose efforts gave us the understanding of weather we have today.18 Miles is a kaleidoscopic and fact-filled journey that uncovers our obsession with the atmosphere and weather — as both evocative metaphor and physical reality. From the roaring winds of Katrina to Palladio’s architectural triumph, La Rotonda, Dewdney entertains as he gives readers a long overdue look at the very air we breathe.

    Buzz Aldrin, one of the first moonwalkers, has no shortage of these ideas. And in Mission to Mars he treats us to how, when, and why we should travel there." -Neil deGrasse TysonLegendary "space statesman" Buzz Aldrin speaks out as a vital advocate for the continuing quest to push the boundaries of the universe as we know it. As a pioneering astronaut who first set foot on the moon during mankind's first landing of Apollo 11--and as an aerospace engineer who designed an orbital rendezvous technique critical to future planetary landings--Aldrin has a vision, and in this book he plots out the path he proposes, taking humans to Mars by 2035.Foreword by Andrew AldrinChapter 1: The View from Air Force OneChapter 2: Time for Decision-makingChapter 3: Your Space: Building the Business CaseChapter 4: Dreams of My MoonChapter 5: Voyage to ArmageddonChapter 6: The March to MarsChapter 7: Homesteading the Red PlanetChapter 8: The Clarion Call

    

    Updated and enhanced, it provides insight on contemporary research and trends in oral histology, embryology, physiology, oral biology, and postnatal growth and development essential to your success in dentistry!Topics for Consideration boxes present expert perspectives on current trends and encourage additional research.Content outlines provide quick reference to specific topics within chapters.Logical organization enhances your understanding of chapter content and helps you review more effectively.Up-to-date recommended readings direct you to additional sources of relevant information.Concise, user-friendly writing style makes complex concepts easier to grasp.Companion CD includes over 300 multiple choice questions and over 100 labeling exercises that help you assess your comprehension and prepare for Part I of the board exam.Hundreds of full-color illustrations visually acquaint you with the oral structures and microscopic anatomy you'll encounter in dental care.Electronic image collection included on the companion CD is now in full-color, giving you clear, vibrant visual references for convenient study and review.

    It's impossible to look up at the stars and NOT think about it: Are we alone in the universe? Books, movies and television shows proliferate that attempt to answer this question and explore it. In Out There Space.com senior writer Dr. Michael Wall treats that question as merely the beginning, touching off a wild ride of exploration into the final frontier. He considers, for instance, the myriad of questions that would arise once we do discover life beyond Earth (an eventuality which, top NASA officials told Wall, is only drawing closer). What would the first aliens we meet look like?Would they be little green men or mere microbes?Would they be found on a planet in our own solar system or orbiting a star far, far away?Would they intend to harm us, and if so, how might they do it?And might they already have visited?Out There is arranged in a simple question-and-answer format. The answers are delivered in Dr. Wall's informal but informative style, which mixes in a healthy dose of humor and pop culture to make big ideas easier to swallow. Dr. Wall covers questions far beyond alien life, venturing into astronomy, physics, and the practical realities of what long-term life might be like for we mere humans in outer space, such as the idea of lunar colonies, and even economic implications. Dr. Wall also shares the insights of some of the leading lights in space exploration today, and shows how the next space age might be brighter than ever.

    The only question is when. In the meantime, we need to get much better at finding objects hurtling our way, and if they’re large enough to penetrate the atmosphere without burning up, figure out what to do about them. We owe many of science’s most important discoveries to the famed Meteor Crater, a mile-wide dimple on the Colorado Plateau created by an asteroid hit 50,000 years ago. In his masterfully researched Fire in the Sky, Dillow unpacks what the Crater has to tell us. Prior to the early 1900s, the world believed that all craters—on the Earth and Moon—were formed by volcanic activity. Not so. The revelation that Meteor Crater and others like it were formed by impacts with space objects has led to a now accepted theory about what killed off the dinosaurs, and it has opened up a new field of asteroid observation, which has recently brimmed with urgency. Dillow looks at great asteroid hits of the past and spends time with modern-day asteroid hunters and defense planning experts, including America’s first Planetary Defense Officer. Satellite sensors confirm that a Hiroshima-scale blast occurs in the atmosphere every year, and a smaller, one-kiloton blast every month. While Dillow makes clear that the objects above can be deadly, he consistently inspires awe with his descriptions of their size, makeup, and origins. At once a riveting work of popular science and a warning to not take for granted the space objects hurtling overhead, Fire in the Sky is, above all, a testament to our universe’s celestial wonders.

    Hubble uses hundreds of the latest, most spectacular images from the HST to illustrate a comprehensive astronomy reference. Stargazers will be astonished to see in color pictures what were once fuzzy photographs, dots on a star map or words in a textbook.Hubble explains how new discoveries are revising scientific understanding of the Universe. Detailed images of the Eagle Nebula show several fingers rising above a massive gas cloud. At the end of each fingertip -- the width of our solar system -- is the birth of a star.The book covers the observable universe in six sections:Stars in the Firmament Stellar Death and Destruction Gregarious Galaxies The Expansive Universe Solar Systems The Heavenly Wanderers Clear and concise text explains the fascinating history of astronomy and the development of the HST. Hubble transports readers to the planets of our solar system and on to galaxies millions -- even billions -- of light years away. These dramatic, unforgettable images will bring into sharp focus how the Universe is unfolding in new and astonishing ways.

    Ranging through the stars and the myths humans have told about them for millennia, Raymo delves into "a pilgrimage in quest of the soul of the night." Chet Raymo's elegant essays link the mysterious phenomena of the night sky with the human mind and spirit, as he ranges through the realms of mythology, literature, religion, history, and anthropology. Originally published two decades ago, The Soul of the Night is a classic work that is a must for those interested in the relationship between science and faith.