MUSIC
The following links provide a good selection of midi files that can be downloaded for free.

Movie Themes  : www.thailander.com
Movie Themes  : www.musicby.jw-music.net
TV Themes       : www.tv-timewarp.co.uk
Classical Music : www.classicalarchives.com

An excellent free sound file conversion tool capable of translating MP3 files to Ogg-Vorbis can be downloaded from :

www.nch.com.au/switch

ASTRONOMY
The following link is to where the Hipparcos Star Catalogue can be found.

cdsweb.u-strasbg.fr

The following link is to an excellent Russian Space Game Website which supports a wide variety of games with a space theme ( including Ad Astra) together with artwork, music and discussion forums.

www.elite-games.ru

Questions and Answers

The link below is an excellent website, which like the Russian one mentioned above supports many Space themed games.

www.spacesimcentral.com

WEBSITE DESIGN
The Ad Astra website was designed by Alexey Botkov. Further examples of his work can be found at :

www.nomand.net