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- 1Alien PlanetsNovember 27, 2007 · 8.0
- 2Cosmic HolesDecember 4, 2007 · 8.0
- 3Mysteries of the MoonDecember 11, 2007 · 8.0
- 4The Milky WayDecember 18, 2007 · 8.0
- 5Alien MoonsJanuary 8, 2008 · 6.3
- 6Dark MatterJanuary 15, 2008 · 8.7
- 7AstrobiologyJanuary 29, 2008 · 7.7
- 8Space TravelFebruary 5, 2008 · 9.0
- 9SupernovasFebruary 12, 2008 · 8.3
- 10ConstellationsFebruary 19, 2008 · 8.5
- 11Unexplained MysteriesFebruary 26, 2008 · 8.3
- 12Cosmic CollisionsMarch 4, 2008 · 7.0
- 13Colonizing SpaceMarch 11, 2008 · 9.0
- 14NebulasApril 1, 2008 · 7.3
- 15Wildest Weather in the CosmosApril 8, 2008 · 6.7
- 16Biggest Things in SpaceApril 15, 2008 · 8.0
- 17GravityApril 22, 2008 · 8.7
- 18Cosmic ApocalypseApril 29, 2008 · 9.0