Sezon 21
Bölümler
1 Sirius, the Dog-Star 17 Oca 1977 2 Travel in Space and Time 17 Şub 1977 3 The Mapping of Mercury 16 Mar 1977 4 Celebrates its 20th anniversary 20 Nis 1977 5 The Solar Cycle 18 May 1977 6 Uranus - the Second Ringed Planet? 15 Haz 1977 7 The New Infra-red Telescope 20 Tem 1977 8 The Swan in the Sky 10 Ağu 1977 9 The Voyager Missions 7 Eyl 1977 10 Stars of the Far South 28 Eyl 1977 11 The Amateur Astronomer 24 Eki 1977 12 Why Do the Planets Shine? 23 Kas 1977 13 Suns, Space-ships, and Bug-eyed Monsters 14 Ara 1977