Sezon 19
Bölümler
1 Orion, the Hunter 6 Oca 1975 2 The New Northern Hemisphere Laboratory 6 Şub 1975 3 Algol: The Winking Demon 5 Mar 1975 4 Astronomy of The Infra-Red 10 Nis 1975 5 The Outer Planets 30 Nis 1975 6 The Mysterious X-rays 30 May 1975 7 The Hot Clouds of the Sun 1 Tem 1975 8 The New Moon 28 Tem 1975 9 The Galilean Satellites 28 Ağu 1975 10 The Origin of the Universe 23 Eyl 1975 11 New Star in Cygnus 22 Eki 1975 12 The Rocks on Venus 12 Kas 1975 13 The Search for Life in the Universe 10 Ara 1975