El riesgo de que los asteroides impacten en la Tierra ha propiciado el desarrollo de nuevos detectores, misiones espaciales y telescopios que permiten catalogar y estudiar su naturaleza. Hace dos siglos se empezaron a descubrir estos objetos rocosos en el cinturón principal que se encuentra entre Marte y Júpiter, y en las últimas décadas se han localizado miles de ellos en la región cercana a la Tierra, algunos potencialmente peligrosos. La Tierra en peligro explica cómo llegan estos planetas menores y los cometas, con qué frecuencia lo hacen, si existen evidencias de grandes colisiones, qué consecuencias han tenido y hasta qué punto han contribuido a la formación del planeta. Este libro ofrece claves de lectura para conocer cómo los científicos intentan desviar los asteroides y así salvaguardar la vida en la Tierra.

The Britannica Enciclopedia Moderna covers all fields of knowledge, including arts, geography, philosophy, science, sports, and much more. Users will enjoy a quick reference of 24,000 entries and 2.5 million words. More then 4,800 images, graphs, and tables further enlighten students and clarify subject matter. The simple A-Z organization and clear descriptions will appeal to both Spanish speakers and students of Spanish.

This book tells the story of how, over the past century, dedicated observers and pioneering scientists achieved our current understanding of the universe. It was in antiquity that humankind first attempted to explain the universe often with the help of myths and legends. This book, however, focuses on the time when cosmology finally became a true science. As the reader will learn, this was a slow process, extending over a large part of the 20th century and involving many astronomers, cosmologists and theoretical physicists. The book explains how empirical astronomical data (e.g., Leavitt, Slipher and Hubble) were reconciled with Einstein's general relativity; a challenge which finally led Friedmann, De Sitter and Lemaître, and eventually Einstein himself, to a consistent understanding of the observational results. The reader will realize the extraordinary implications of these achievements and how deeply they changed our vision of the cosmos: From being small, static, immutable and eternal, it became vast and dynamical - originating from (almost) nothing, and yet now, nearly 14 billion years later, undergoing accelerated expansion. But, as always happens, as well as precious knowledge, new mysteries have also been created where previously absolute certainty had reigned.

“A wonderfully lucid, accessible, and wide-ranging account of the boundary between justified and unjustified belief.” —Sam Harris, New York Times–bestselling author of The Moral Landscape and The End of Faith In this work synthesizing thirty years of research, psychologist, historian of science, and the world’s best-known skeptic Michael Shermer upends the traditional thinking about how humans form beliefs about the world. Simply put, beliefs come first and explanations for beliefs follow. The brain, Shermer argues, is a belief engine. From sensory data flowing in through the senses, the brain naturally begins to look for and find patterns, and then infuses those patterns with meaning. Our brains connect the dots of our world into meaningful patterns that explain why things happen, and these patterns become beliefs. Once beliefs are formed the brain begins to look for and find confirmatory evidence in support of those beliefs, which accelerates the process of reinforcing them, and round and round the process goes in a positive-feedback loop of belief confirmation. Shermer outlines the numerous cognitive tools our brains engage to reinforce our beliefs as truths. Interlaced with his theory of belief, Shermer provides countless real-world examples of how this process operates, from politics, economics, and religion to conspiracy theories, the supernatural, and the paranormal. Ultimately, he demonstrates why science is the best tool ever devised to determine whether or not a belief matches reality. “A must read for everyone who wonders why religious and political beliefs are so rigid and polarized—or why the other side is always wrong, but somehow doesn’t see it.” —Dr. Leonard Mlodinow, physicist and author of The Drunkard’s Walk and The Grand Design (with Stephen Hawking)

Because the original was so popular, the geniuses behind Project ASTRO have created an additional volume of activities. These 25 activities explore and explain mysteries of the universe: the moon's phases, the reasons for the seasons, comets and meteors, stars, and space exploration. Also designed in loose-leaf format, More Universe... is a great supplement to the original, or a perfect sampler if you want to start small.

A looseleaf (3-hole punched, binder not included) resource guide that includes a wide range of activities, annotated resource lists, and background readings, primarily for teachers who would like to incorporate more astronomy into their classroom work but may be held back by their own limited backgr

In Einstein in Love, Dennis Overbye has written the first profile of the great scientist to focus exclusively on his early adulthood, when his major discoveries were made. It reveals Einstein to be very much a young man of his time-draft dodger, self-styled bohemian, poet, violinist, and cocky, charismatic genius who left personal and professional chaos in his wake. Drawing upon hundreds of unpublished letters and a decade of research, Einstein in Love is a penetrating portrait of the modern era's most influential thinker.