S04 Episode 1
Death Stars
44 mins · Tue, 18 Aug 2009
S04 Episode 2
The Day the Moon Was Gone
44 mins · Tue, 25 Aug 2009
S04 Episode 3
It Fell From Space
44 mins · Tue, 1 Sep 2009
S04 Episode 4
Biggest Blasts
45 mins · Tue, 8 Sep 2009
S04 Episode 5
The Hunt for Ringed Planets
45 mins · Tue, 15 Sep 2009
S04 Episode 6
10 Ways to Destroy the Earth
45 mins · Tue, 22 Sep 2009
S04 Episode 7
The Search for Cosmic Clusters
45 mins · Tue, 29 Sep 2009
S04 Episode 8
Space Wars
45 mins · Tue, 6 Oct 2009
S04 Episode 9
Liquid Universe
45 mins · Tue, 20 Oct 2009
S04 Episode 10
Pulsars & Quasars
45 mins · Tue, 27 Oct 2009
S04 Episode 11
Science Fiction. Science Fact
45 mins · Tue, 3 Nov 2009
S04 Episode 12
Extreme Energy
45 mins · Tue, 10 Nov 2009