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Until recently collisions between the Earth and a comet were thought to be so rare that the threat to life on Earth from such objects was dismissed as being too unlikely to worry about. This book shows the threats and precarious nature of life here.

Comets. --- Asteroids. --- Impact craters. --- Extinction (Biology) --- Minor planets --- Planetoids --- Planets, Minor --- Near-Earth objects --- Animals --- Extirpation (Biology) --- Biology --- Extinct animals --- Astroblemes --- Impact structures --- Cratering --- Geology, Structural --- Extinction --- Extirpation --- Asteroids --- Comets --- Evolution (Biology) --- Impact --- #Hist.Geol --- 551.439 --- 551.439 Relief forms of extraterrestrial origin. Meteor craters --- Relief forms of extraterrestrial origin. Meteor craters --- Collisions (Physics) --- Materials --- Blast effect --- Shock (Mechanics) --- Splashes --- Animal evolution --- Biological evolution --- Darwinism --- Evolutionary biology --- Evolutionary science --- Origin of species --- Evolution --- Biological fitness --- Homoplasy --- Natural selection --- Phylogeny --- Dynamic testing --- Earth (Planet) --- Earth --- Impact.