39:27

Living in Space

16:25

New Evidence From Beneath The 'Doomsday' Glacier

34:44

Interstellar Colonization Strategies

31:37

The Stanford Torus Space Habitat

23:05

This Should Be Impossible...

41:06

The Fermi Paradox: Imprisoned Planets

33:03

Deep Space Habitats

36:18

Escaping the Galaxy