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Alternity is not officially available for purchase anywhere except second-hand. JSM3050 wrote a letter to WoTC asking for official reprints and/or digital sales on DriveThruRPG - topic. Maybe a few more fan letters would encourage the sales dept.
Based on the rules in Cosmos 2.0, generate a random Solar System for your space-faring RPG sessions using this page. The graphics are SVG so they will print at high quality and the background will be white. To save a generated Solar System, just "save as" a "complete webpage". Any comments about the generator can be added here