Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An impact event is the collision of a large meteorite, asteroid, comet, or other celestial object with the Earth or another planet. Throughout recorded history, hundreds of minor impact events have been reported, with some occurrences causing deaths, injuries, property damage or other significant localised consequences. However, there have also been major impact events throughout Earth's history which severely disrupted the environment and caused mass extinctions. Learn more about impact events, their likelihood and possible effects on our planet in the following pages.