derrierloisirs.fr
» » Impact!: The Threat of Comets and Asteroids

Download Impact!: The Threat of Comets and Asteroids ePub

by Gerrit L. Verschuur

Download Impact!: The Threat of Comets and Asteroids ePub
  • ISBN 0195101057
  • ISBN13 978-0195101058
  • Language English
  • Author Gerrit L. Verschuur
  • Publisher Oxford University Press (October 24, 1996)
  • Pages 256
  • Formats mbr azw doc txt
  • Category Math
  • Subcategory Astronomy and Space Science
  • Size ePub 1674 kb
  • Size Fb2 1548 kb
  • Rating: 4.3
  • Votes: 483

Most scientists now agree that some sixty-five million years ago, an immense comet slammed into the Yucatan, detonating a blast twenty million times more powerful than the largest hydrogen bomb, punching a hole ten miles deep in the earth. Trillions of tons of rock were vaporized and launched into the atmosphere. For a thousand miles in all directions, vegetation burst into flames. There were tremendous blast waves, searing winds, showers of molten matter from the sky, earthquakes, and a terrible darkness that cut out sunlight for a year, enveloping the planet in freezing cold. Thousands of species of plants and animals were obliterated, including the dinosaurs, some of which may have become extinct in a matter of hours. In Impact, Gerrit L. Verschuur offers an eye-opening look at such catastrophic collisions with our planet. Perhaps more important, he paints an unsettling portrait of the possibility of new collisions with earth, exploring potential threats to our planet and describing what scientists are doing right now to prepare for this awful possibility. Every day something from space hits our planet, Verschuur reveals. In fact, about 10,000 tons of space debris fall to earth every year, mostly in meteoric form. The author recounts spectacular recent sightings, such as over Allende, Mexico, in 1969, when a fireball showered the region with four tons of fragments, and the twenty-six pound meteor that went through the trunk of a red Chevy Malibu in Peekskill, New York, in 1992 (the meteor was subsequently sold for $69,000 and the car itself fetched $10,000). But meteors are not the greatest threat to life on earth, the author points out. The major threats are asteroids and comets. The reader discovers that astronomers have located some 350 NEAs ("Near Earth Asteroids"), objects whose orbits cross the orbit of the earth, the largest of which are 1627 Ivar (6 kilometers wide) and 1580 Betula (8 kilometers). Indeed, we learn that in 1989, a bus-sized asteroid called Asclepius missed our planet by 650,000 kilometers (a mere six hours), and that in 1994 a sixty-foot object passed within 180,000 kilometers, half the distance to the moon. Comets, of course, are even more deadly. Verschuur provides a gripping description of the small comet that exploded in the atmosphere above the Tunguska River valley in Siberia, in 1908, in a blinding flash visible for several thousand miles (every tree within sixty miles of ground zero was flattened). He discusses Comet Swift-Tuttle--"the most dangerous object in the solar system"--a comet far larger than the one that killed off the dinosaurs, due to pass through earth's orbit in the year 2126. And he recounts the collision of Comet Shoemaker-Levy 9 with Jupiter in 1994, as some twenty cometary fragments struck the giant planet over the course of several days, casting titanic plumes out into space (when Fragment G hit, it outshone the planet on the infrared band, and left a dark area at the impact site larger than the Great Red Spot). In addition, the author describes the efforts of Spacewatch and other groups to locate NEAs, and evaluates the idea that comet and asteroid impacts have been an underrated factor in the evolution of life on earth. Astronomer Herbert Howe observed in 1897: "While there are not definite data to reason from, it is believed that an encounter with the nucleus of one of the largest comets is not to be desired." As Verschuur shows in Impact, we now have substantial data with which to support Howe's tongue-in-cheek remark. Whether discussing monumental tsunamis or the innumerable comets in the Solar System, this book will enthrall anyone curious about outer space, remarkable natural phenomenon, or the future of the planet earth.

In Impact, Gerrit L. Verschuur offers an eye-opening look at such catastrophic collisions with our planet.

In Impact, Gerrit L. And he recounts the collision of Comet Shoemaker-Levy 9 with Jupiter in 1994, as some twenty cometary fragments struck the giant planet over the course of several days, casting titanic plumes out into space (when Fragment G hit, it outshone the planet on the infrared band, and left a dark area at the impact site larger than the Great Red Spot). In addition, the author describes the efforts of Spacewatch and other groups to locate NEAs, and evaluates the idea that comet and asteroid impacts have been an underrated factor in the evolution of life on earth. Verschuur offers an eye-opening look at catastrophic collisions with our planet. Comets, of course, are even more deadly. Perhaps more important, he paints an unsettling portrait of the possibility of new collisions with earth, exploring potential threats to our planet and describing what scientists are doing right now to prepare for this awful possibility. Verschuur provides a gripping description of the small comet that exploded in the atmosphere above the Tunguska River valley in Siberia, in 1908, in a blinding flash visible for several thousand miles (every tree within sixty miles of ground zero was flattened).

This book discusses comets and asteroids as the possible cause of impacts. I picked up this book on a whim, and found myself fascinated by the science. Its about the threat of comets and asteroids and the potential of collision with earth

This book discusses comets and asteroids as the possible cause of impacts. Its about the threat of comets and asteroids and the potential of collision with earth. look what happened to the dinosaurs! LOL, actually, the threat of being hit by a much smaller rock is far greater, Earth is hit every year by many small objects which most people never see or are noticed, (except by science-types).

Learn to light a candle in the darkest moments of someone’s life. Be the light that helps others see; it is what gives life its deepest significance. Be the light that helps others see; it is what gives life its deepest significance Let Your Life Speak Listening for the Voi - Parker J Palmer. pdf Let Your Life Speak: Listening for the Voice of Vocati. Systems Thinking, : Managing Chaos and Complexity: A Platform for Designing Business Architecture. Verschuur offers an eye-opening look at catastrophic c. .Goodreads helps you keep track of books you want to read. Start by marking Impact!: The Threat of Comets and Asteroids as Want to Read: Want to Read savin. ant to Read.

by Gerrit L. Verschuur. Its about the threat of comets and asteroids and the potential of collision with earth

by Gerrit L. The definitive book on impact hazards. com User, July 9, 2002.

Impact! - The Threat of Comets and Asteroids" by Gerrit L Verschuur published by Oxford University Press, New York 1996 xii + 237 pages.

Gerrit L. Verschuur was born in 1937 in Cape Town, South Africa, at the foot of Table Mountain. Impact!: The Threat of Comets and Asteroids.

Gerrit L. In 1936, his parents had emigrated from the Netherlands and settled in Cape Town. Two years after he was born-in 1939-his parents moved again, choosing a suburb of Cape Town named Lakeside. Oxford University Press, 1996.

Threat of Comets and Asteroids-Gerrit L. Verschuur -Impact! . This book calls attention to cosmic threats and the precarious nature of life on Earth. Verschuur -Impact!: Threat of Comets and Asteroids-Gerrit L. item 2 Impact!: the threat of comets and asteroids by Gerrit L Verschuur (Hardback) -Impact!: the threat of comets and asteroids by Gerrit L Verschuur (Hardback). item 3 Impact!: Threat of Comets and Asteroids By Gerrit L. Verschuur -Impact!: Threat of Comets and Asteroids By Gerrit L.

Noted radio astronomer and author Gerrit L. Verschuur paints an unsettling portrait of the possibility of collisions between the earth and comets and asteroids in space

Noted radio astronomer and author Gerrit L. Verschuur paints an unsettling portrait of the possibility of collisions between the earth and comets and asteroids in space. Verschuur explores potential threats to our planet and describes what scientists are doing to prepare for the frightening possibility. 2 people like this topic.

Talk about Impact!: The Threat of Comets and Asteroids


Pedar
The chance of Earth being struck by a large asteroid or comet is neither more nor less now than it has ever been. If nothing else, this book will bring out that fact. So for all the folks who want to believe in the magical or the preposterous, such as Nostradamus, Velikovsky, and other fantasy spinners, go elsewhere
If, however, you are a person who accepts things scientific, this is your book. Professsor Verschuur is an excellent, lucid, organized writer who does not waste the reader's time with forays into the specculative or ludicrous. Instead he forthrightly presents the overview of, and the detail behind, the genuine, if remote, danger that human society will receive heavy damage, if not outright destruction, from a large impact event. He accurately points out that the remoteness of this eventuality is offset by the magnitude of destruction that will occur if a large impact happens.
I have studied impact phenomena for some years, and this book is the most-fact-filled, well organized book of its genre. It is not only an excellent starting volume for a study of this branch of science, but is a good wake-up call for organizing attempts to meet the danger. The Professor does not patronize his reader, but neither does he presume a level of knowledge beyond the ken of the average well-informed adult.
I recommend the book very highly and would urge anyone interested in this topic to make it a priority purchase. It is the book by which all similar texts should be measured.
Buzalas
I picked up this book on a whim, and found myself fascinated by the science. Its about the threat of comets and asteroids and the potential of collision with earth. If you are concerned, you should be, especially if the projectile is large and lands in the sea- deadly Tsunamis and tidal waves could be the result....look what happened to the dinosaurs! LOL, actually, the threat of being hit by a much smaller rock is far greater, Earth is hit every year by many small objects which most people never see or are noticed, (except by science-types).

This book covers historical, ancient, and modern perspective towards the stellar apparitions. While parts are a little dry, it's a good read for science geeks, or those interested in learning about asteroids and meteors. I found the author's occasional witty commentary funny, and the historical notes fascinating. An excellent, read all-around. 4 stars.
Hunaya
This author has stolen the foundational idea of this book from the great scientist Dr. Immanuel Velikovsky who wrote the best seller "Worlds in Collision" in 1950. Then this author, Verschuur, trashes Velikovsky. Verschuur states hackneyed cliches about Velikovsky that were part of the most disgusting scientific blackballing in history. Verschuur does not address all of the overwhelming evidence that NASA has devoped over the last 40 years which were all anticipated by Velikovsky. What about the 900 degree surface temperature of Venus, or radio signals from Jupiter, or thick dust on the moon (remember the footprints of our astronauts?), or the scores of other discoveries all of which Velikovsky clearly anticipated and Verschuur ignores while promoting his own daffy theory. As an objective writer, Verschuur is a failure, and as an observer of alternative science he is lame.