Hypothetical Earth impact events

extinction event ending the Mesozoic Era

widespread and rapid decrease in the amount of life on earth

mass extinction event at the end of the Permian Period approximately 250 million years ago

planet that is hypothesized to have impacted Earth and created the Moon

hypothesized event, occurring ca. 4.1–3.8 billion years ago, during which a large number of asteroids collided with the Moon, Mercury, Venus, Earth, and Mars

theory that the Moon formed out of the debris left over from a collision between Earth and an astronomical body the size of Mars, approximately 4.5 billion years ago

theory

asteroid impact hypothesis as cause of the Cretaceous–Paleogene extinction

hypothesis on what initiated the Younger Dryas geological period

scientific theory concerning impact events

asteroid impact in the southeast Pacific Ocean

hypothesis