Extinction eventW
Extinction event
Alvarez hypothesisW
Alvarez hypothesis
Andromeda–Milky Way collisionW
Andromeda–Milky Way collision
Cretaceous–Paleogene extinction eventW
Cretaceous–Paleogene extinction event
Eltanin impactW
Eltanin impact
Giant-impact hypothesisW
Giant-impact hypothesis
Late Heavy BombardmentW
Late Heavy Bombardment
Nibiru cataclysmW
Nibiru cataclysm
Permian–Triassic extinction eventW
Permian–Triassic extinction event
Theia (planet)W
Theia (planet)