Understanding - 1994 Asteroids and Comets was released on:
USA: 2001
Cosmic Travelers Comets and Asteroids - 1997 TV was released on: USA: 1997
Comets - 1919 was released on: USA: 30 March 1919
Sightings - 1992 Comets was released on: USA: 11 November 1995
Bailey's Comets - 1973 - 1.3 was released on: USA: 23 September 1973
Bailey's Comets - 1973 - 1.4 was released on: USA: 30 September 1973
Asteroids - 1998 VG was released on: USA: 30 November 1998 (PC version)
Comets Prophets of Doom - 2006 TV was released on: USA: 13 March 2006
Comets Time Capsules of the Solar System - 1981 was released on: USA: 1981
History's Mysteries - 1998 Asteroids 11-8 was released on: USA: 2006
How the Universe Works - 2010 Comets 2-6 was released on: USA: 15 August 2012
Droids - 1985 Tail of the Roon Comets - 1.10 was released on: USA: 9 November 1985 UK: 14 March 1988
Bailey's Comets - 1973 Rahja and Out Ghost of a Clue 1-2 was released on: USA: 16 September 1973