Hold the [Alt] key and type in these codes:

 Einstein  - All research
 Moola     - 1,000 BC
 Menlo     - Another Research cheat
 Iseeall   - Shows all planets and players
 Allai     - AI cheat
 Score     - Gives you the score of your game
 Canboly1  - Unites all the computer opponents in war against you
 Crunch    - finishes your current building project at your colony

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 Try April 1st as system date ;-)