7 - 1How Big, How Far, How Fast Apr. 29, 2012
7 - 2Alien Sounds May. 06, 2012
7 - 3Our Place in the Milky Way May. 13, 2012
7 - 4Deep Freeze May. 20, 2012
7 - 5Microscopic Universe Jun. 03, 2012
7 - 6Ride the Comet Jun. 10, 2012
7 - 7When Space Changed History Jun. 17, 2012