Rogue Asteroids and Doomsday Comets: The Search for the Million Megaton Menace That Threatens Life on Earth

I liked the book, but do not rate it as highly as "Rain of Iron and Ice" by John S. Lewis and "Impact" by Gerrit L Verschuur. However, it is much better than "Fire on Earth" by John and Mary Gribben. My chief reservation about Steel's work is that he seems easily drawn to flights of whimsy such as Clube's and Napier's contentions regarding Beta Taurid cometary impacts that have affected history on a mammoth scale. While these are captivating proposals, perhaps, there isn't enough hard scientific evidence for them clutter up what was otherwise a hitherto fine scientific presentation of a real problem by Steel. Up to the author's dalliance into the speculative, the book is a good read about a serious, overlooked, preventable threat. His admonitions should be taken seriously.

To the publisher I would appreciate it if the publisher could produce an audio adaptation of this book. I would love to listen to this while I drive to work and to let my 16 month old son listen to it as a bedtime story. My goal is to expose him to some of my favorite passions, maths, sciences, physics, geophysics, paleontology, astronomy, electronics, photonics, new science and discoveries etc. The more audio books you can produce of the above genre the more I will support you. Arnold D Veness

Three events in the past decade have caused a great deal of interest in objects around us in space. Giotto's encounter with Halleys Comet, Hubble Space Telescope pictures of the Shoemaker/Levy comet crashing onto Jupiter and lastly the naked eye sightings of the Hale/Bopp Comet we have enjoyed earlier in the year. Originally from Somerset, Duncan Steel now works at the Anglo-Australian Observatory and his book provides a very readable account of the nature and movements of these very varied objects.Ever since the first pictures of other planets and in particular their moons arrived, studies have been made of their cratering records. Pictures from space have also been the main method of detecting craters but this time down on earth where plate tectonics, erosion, sediments or vegetation tend to erase them.Astronomy and Geology linked up when cosmic impact events were suggested as possible cause or trigger for some of the major extinctions we find in the fossil record. The effects of both solar and cosmic cycles on all aspects of life on the planet are now widely studied.Mr. Steel gives an account of a very bright meteor seen by many people in 1993 in New South Wales. When asked for an estimate of how soon it would before another such sighting to occur the answer was given in years. One week later, however, an object estimated to be 2-3 meters in size and traveling at 30Km/Sec exploded 18Km overhead with the amount of energy produced by a Hiroshima Bomb. Events such as these and the trail of impacts left on Jupiter show that objects in space are certainly not solitary. Lines of craters have been found on other moons in the system. Comet Hale/Bopp provided a spectacular sight a few months ago but for now the interest is in the debris and dust they and asteroids can leave behind often in highly eccentric trails across our orbit. Gravitational forces and solar wind affect the objects and the trails have a structure and it is the "busy" parts of the belt which give the peaks to meteor showers as we pass. The widely varying time scales which have been linked with extinctions and other cycles are the result of earth and solar system moving round the galaxy.The possible effects of a large impact, global warming, ice ages, large fire storms or basalt floods have all been discussed elsewhere but the book considers several other theories. A large object landing in the ocean could cause a truly instant catastrophe.This is the tsunami wave which can be caused by earthquakes or large undersea slope collapse. Islands in the middle of the Pacific can feel the effects of activity right across the ocean. The sloping continental shelves amplify the height of the waves and in low lying areas they can reach well in land. Observations of the cratering pattern on Mercury led to one theory where the shock waves from a large impact travel round the globe and fracture the crust on the opposite side. Reconstruction of the continents