Sezon 17
Bölümler
1 1973 - an Exciting Year! 8 Oca 1973 2 Practical Work in the Observatory 7 Şub 1973 3 Sirius - The Brightest Star 19 Mar 1973 4 The Eclipse of the Century 2 Nis 1973 5 How Big are the Planets? 30 Nis 1973 6 The Colours of the Stars 4 Haz 1973 7 The African Eclipse 11 Tem 1973 8 Navigational Astronomy 1 Ağu 1973 9 Venus - A Cratered World 22 Ağu 1973 10 The Moon Illusion 18 Eyl 1973 11 The Volcanoes of Mars 17 Eki 1973 12 When Mercury Crosses the Sun 7 Kas 1973 13 Pioneer to Jupiter 12 Ara 1973