Originally published in 1984
From the original publication:
The Saturn system is the most complex in the solar system, and this book is to summarize it all: the planet, rings, satellites, the magnetospheres, and the interaction with the interplanetary medium. The effective date of the material is approximately November 1983.
Discoveries in astronomy challenge our fundamental ideas about the universe. Where the astronomers of antiquity once spoke of fixed stars, we now speak of whirling galaxies and giant supernovae. Where we once thought Earth was the center of the universe, we now see it as a small planet among millions of other planetary systems, any number of which could also hold life. These dramatic shifts in our perspective hinge on thousands of individual discoveries: moments when it became clear to someone that some part of the universe—whether a planet or a supermassive black hole—was not as it once seemed.
Secrets of the Universe invites us to participate in these moments of revelation and wonder as scientists first experienced them. Renowned astronomer Paul Murdin here provides an ambitious and exciting overview of astronomy, conveying for newcomers and aficionados alike the most important discoveries of this science and introducing the many people who made them. Lavishly illustrated with more than 400 color images, the book outlines in seventy episodes what humankind has learned about the cosmos—and what scientists around the world are poised to learn in the coming decades. Arranged by types of discovery, it also provides an overarching narrative throughout that explains how the earliest ideas of the cosmos evolved into the cutting-edge astronomy we know today. Along the way, Murdin never forgets that science is a human endeavor, and that every discovery was the result of inspiration, hard work, or luck—usually all three.
The first section of Secrets explores discoveries made before the advent of the telescope, from stars and constellations to the position of our own sun. The second considers discoveries made within our own solar system, from the phases of Venus and the moons of Jupiter to the comets and asteroids at its distant frontier. The next section delves into discoveries of the dynamic universe, like gravitation, relativity, pulsars, and black holes. A fourth examines discoveries made within our own galaxy, from interstellar nebulae and supernovae to Cepheid variable stars and extrasolar planets. Next Murdin turns to discoveries made within the deepest recesses of the universe, like quasars, supermassive black holes, and gamma ray bursters. In the end, Murdin unveils where astronomy still teeters on the edge of discovery, considering dark matter and alien life.
Skywatchers of Ancient Mexico helped establish the field of archaeoastronomy, and it remains the standard introduction to this subject. Combining basic astronomy with archaeological and ethnological data, it presented a readable and entertaining synthesis of all that was known of ancient astronomy in the western hemisphere as of 1980.
In this revised edition, Anthony Aveni draws on his own and others' discoveries of the past twenty years to bring the Skywatchers story up to the present. He offers new data and interpretations in many areas, including:
With this updated information, Skywatchers will serve a new generation of general and scholarly readers and will be useful in courses on archaeoastronomy, astronomy, history of astronomy, history of science, anthropology, archaeology, and world religions.
The phenomenal growth of modern astronomy, including the invention of the coronagraph and major developments in telescope design and photographic technique, is unparalleled in many centuries. Theories of relativity, the concept and measurement of the expanding universe, the location of sun and planets far from the center of the Milky Way, the exploration of the interiors of stars, the pulsation theory of Cepheid variation, and investigations of interstellar space have profoundly altered the astronomer's approach.
These fundamental discoveries are reported in papers by such eminent scientists as Albert Einstein, Sir Arthur S. Eddington, Henry Norris Russell, Sir James Jeans, Meghnad Saha, Otto Struve, Fred L. Whipple, Bernard Lyot, Jan H. Oort, and George Ellery Hale. The Source Book's 69 contributions represent all fields of astronomy. For example, there are reports on the equivalence of mass and energy (E = mc²) of the special theory of relativity; building the 200-inch Palomar telescope; the scattering of galaxies suggesting a rapidly expanding universe; stellar evolution; and the Big Bang and Steady State theories of the universe's origin.
When at the beginning of this century, new instrumentation in astronomy came together with innovative concepts in physics, a science was born that has yielded not only staggering quantities of information about the universe but an elegant and useful conception of its origins and behavior. This volume in Harvard’s distinguished series of Source Books serves to record the achievements of this science and illuminate its brief history by bringing together the major contributions through the year 1975.
The volume is organized to trace the development of the basic ideas of astrophysics. The 132 selections document chronologically the changing answers to such fundamental questions as: How did the solar system originate? What makes the stars shine? What lies in the vacuous space between the stars? Are the spiral nebulae distant “island universes”? Will the universe expand forever? The articles range from Hale’s popular piece in Harper’s Magazine to the tensor calculus of Schwarzschild and Einstein. They include Chamberlain and Moulton’s account of the collision hypothesis; Edwin Hubble’s identification of the Crab Nebula with the supernova of 1054; Ralph Fowler’s work on the application of degenerate gas statistics to white dwarfs; and Jan Oort’s detection of galactic rotation. The complexity and richness of twentieth-century astrophysics is felt in these selections and a sense of discovery is provided in reading, in the words of the pioneer scientist, accounts of the first observations of the cosmic rays, the Van Allen belts, the Martian volcanoes and canyons, pulsars, interstellar hydrogen, cosmic magnetic fields, quasars and the remnant background of the primeval big bang.
About half of the papers are printed in their entirety and the others in careful abridgment. Editors Kenneth Lang and Owen Gingerich provide substantial commentary that describes related developments before, during and after the selected research. Works by Heinrich Vogt, Carl Friedrich von Weizsacker, Karl Schwarzschild, Albert Einstein, Aleksandr Friedman and many others appear for the first time in translation.
A Telegraph Best Science Book of the Year
“A witty yet in-depth exploration of the prospects for human habitation beyond Earth…Spacefarers is accessible, authoritative, and in the end, inspiring.”
—Richard Panek, author of The Trouble with Gravity
It’s been over fifty years since Apollo 11 landed on the moon. So why is there so little human presence in space? Will we ever reach Mars? And what will it take to become a multiplanet species? While many books have speculated on the possibility of living beyond the Earth, few have delved into the practical challenges.
A wry and compelling take on the who, how, and why of near-future colonies in space, Spacefarers introduces us to the engineers, scientists, planners, dreamers, and entrepreneurs who are striving right now to make life in space a reality. While private companies such as SpaceX are taking the lead and earning profits from human space activity, Christopher Wanjek is convinced this is only the beginning. From bone-whittling microgravity to eye-popping profits, the risks and rewards of space settlement have never been so close at hand. He predicts we will have hotels in low-earth orbit, mining and tourism on the Moon, and science bases on Mars—possibly followed (gravity permitting) by full blown settlements.
“Nerdily engaging (and often funny)…Technology and science fiction enthusiasts will find much here to delight them, as Wanjek goes into rich detail on rocketry and propulsion methods, including skyhooks and railguns to fling things into orbit…He is a sensible skeptic, yet also convinced that, in the long run, our destiny is among the stars.”
—The Guardian
“If the events of this year have had you daydreaming about abandoning the planet entirely, [Spacefarers] is a geekily pleasurable survey of the practicalities and challenges.”
—The Telegraph
“The best book I’ve read on space exploration since Isaac Asimov.”
—Michael Shermer, publisher of Skeptic
Could the $50 purchase of an ancient coin by a Rutgers astronomer have unlocked the mystery of the Christmas Star? For years, scientists have looked, with little success, to astronomical records for an explanation of the magical star that guided the Magi to Christ’s manger. Intrigued by the image he found on the latest addition to his coin collection, Michael Molnar thought there might be more to learn by looking, instead, at the teachings of ancient astrologers.
Molnar argues in his book that the Star of Bethlehem was not a star at all, but rather a regal portent centering around the planet Jupiter that was eclipsed by the moon. He bases this theory on the actual beliefs of astrologers, such as the Magi, who lived around the time of Christ. Molnar found some intriguing clues to the mystery while researching the meaning of astrological symbols he found an ancient coin, which bore the image of Aries looking back at a star. He found that Aries was a symbol of Judea at the time, and that ancient astrologers believed that a new king would be born when the moon passed in front of Jupiter. Molnar wondered, could the coin have been issued as a response to the Great Messianic Portent, the Star of Bethlehem?
To match the story of the appearance of the Christmas star, Molnar also knew the event had to happen when Jupiter was “in the east.” Using these criteria and a computer program, he was able to chart an eclipse of Jupiter in Aries on April 17, 6 B.C., a day when Jupiter was precisely “in the east,” which confirmed his theory. Moreover, he found that a Roman astrologer described the conditions of that day as fitting the birth of a “divine and immortal” person.
According to Harvard University Professor Owen Gingerich, “this is the most original and important contribution of the entire 20th century” about the Magi’s star. Using clues from astronomy, astrology, and history, Molnar has created a provocative, fascinating theory on the Christmas Star. He weaves together an intriguing scientific detective story which resolves one of the world’s greatest mysteries: The Star of Bethlehem at the birth of Christ.
Could the $50 purchase of an ancient coin by a Rutgers astronomer have unlocked the mystery of the Christmas Star? For years, scientists have looked, with little success, to astronomical records for an explanation of the magical star that guided the Magi to Christ’s manger. Intrigued by the image he found on the latest addition to his coin collection, Michael Molnar thought there might be more to learn by looking, instead, at the teachings of ancient astrologers.
Molnar argues in his book that the Star of Bethlehem was not a star at all, but rather a regal portent centering around the planet Jupiter that was eclipsed by the moon. He bases this theory on the actual beliefs of astrologers, such as the Magi, who lived around the time of Christ. Molnar found some intriguing clues to the mystery while researching the meaning of astrological symbols he found an ancient coin, which bore the image of Aries looking back at a star. He found that Aries was a symbol of Judea at the time, and that ancient astrologers believed that a new king would be born when the moon passed in front of Jupiter. Molnar wondered, could the coin have been issued as a response to the Great Messianic Portent, the Star of Bethlehem?
To match the story of the appearance of the Christmas star, Molnar also knew the event had to happen when Jupiter was “in the east.” Using these criteria and a computer program, he was able to chart an eclipse of Jupiter in Aries on April 17, 6 B.C., a day when Jupiter was precisely “in the east,” which confirmed his theory. Moreover, he found that a Roman astrologer described the conditions of that day as fitting the birth of a “divine and immortal” person.
According to Harvard University Professor Owen Gingerich, “this is the most original and important contribution of the entire 20th century” about the Magi’s star. Using clues from astronomy, astrology, and history, Molnar has created a provocative, fascinating theory on the Christmas Star. He weaves together an intriguing scientific detective story which resolves one of the world’s greatest mysteries: The Star of Bethlehem at the birth of Christ.
Between 1650 and 1750, four Catholic churches were the best solar observatories in the world. Built to fix an unquestionable date for Easter, they also housed instruments that threw light on the disputed geometry of the solar system, and so, within sight of the altar, subverted Church doctrine about the order of the universe.
A tale of politically canny astronomers and cardinals with a taste for mathematics, The Sun in the Church tells how these observatories came to be, how they worked, and what they accomplished. It describes Galileo's political overreaching, his subsequent trial for heresy, and his slow and steady rehabilitation in the eyes of the Catholic Church. And it offers an enlightening perspective on astronomy, Church history, and religious architecture, as well as an analysis of measurements testing the limits of attainable accuracy, undertaken with rudimentary means and extraordinary zeal. Above all, the book illuminates the niches protected and financed by the Catholic Church in which science and mathematics thrived.
Superbly written, The Sun in the Church provides a magnificent corrective to long-standing oversimplified accounts of the hostility between science and religion.
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