It is thought that most comets originate in a vast cloud of ice and dust that surrounds the solar system the oort cloud as it is called extends several thousand times farther from the sun than pluto the outermost planet. Comets and their origin guillermo munoz caro comets are very primitive objects that formed far away from the sun and therefore provide important clues about the formation of the solar system these celestial objects might also be related to our own origin the appearance of the first life forms could have been triggered by asteroid comet impacts on the primitive earth in addition the . Originally published in 1953 this book first sets out some observational facts about comets then the greater part of the book accounts for their origin and explains how comet tails are formed the text contains 34 photographs of celebrated comets including eight of halleys comet a comet index is also provided this book will be of value to anyone with an interest in the development of astronomy and the history of science. The long orbited comets rotate outside the oort cloud and before the nearest star their orbits are usually calculated as millions and millions of years longer some comets mostly passes outside the solar system and once in millions of years and are rotating around a big star which is thousands of light years away from us these comets are usually named as the hyperbolic comets some comets also pass through the solar system and they could be observed sometimes when a comet passes very