Space Rock Families (6:22)
Comets: Icy Rocks with Tails (4:38)
Late Heavy Bombardment Period (2:12)
Refuge for Space Rocks (2:24)
Impact Event and Extinction of Dinosaurs (3:45)
Meteor Crater (3:33)
Cataclysmic Collision with Earth (4:49)
Earth's Biggest Extinction Event (3:39)
Scientific Study of Permian-Triassic Extinction (2:56)
Volcanism and Extinction (2:19)
Cosmic Upheaval (3:07)
Star Collisions (2:56)
Credits: Cosmic Collisions (0:23)