31:11

The Fermi Paradox: Technological Timebombs

33:59

Black Sun Rising: Living On A Planet Around A Black Hole

25:56

Hitchhiking the Galaxy

20:34

Is Interstellar Travel Impossible?

30:21

Alien Environments

34:24

Lost Space Colonies

11:44

Obese Soldiers in War

38:12

Your Own Personal Spaceship