The explosive growth of knowledge in the field of space exploration and, in particular the interdisciplinary character of the subject of collisions in the solar system, put the scientific interest of planetary and galactic astronomers, as well as specialists in geophysics, dynamics, and cosmochemistry in a common focus. Obvious highlights include the explosion in the rate of discoveries of Kuiper belt objects; better understanding of dynamics of main belt asteroids and the processes affecting their injection into the inner planets crossing orbits; growing understanding of the importance of comets and asteroids in the delivery of volatiles to the inner planets and even possibly in life origin on the Earth; great acceleration of NEO discovery and more reliable prediction of their future threat to the Earth. All these topics are thoroughly addressed and discussed by specialists in the field on a comprehensive basis. Owing to its interdisciplinary character the book should meet an interest of specialists in the different fields of astronomy, planetary and Earth sciences.