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The Dosadi Experiment was created in 1977.
Here are just a few fictional planets starting with D:
Dagobah (Star Wars)
Dantooine (Star Wars)
Dathomir (Star Wars)
Dosadi (The Dosadi Experiment)
D'qar (Star Wars)
Druidia (Spaceballs)
Duna (Kerbal Space Program)
Life is an experiment. When you die, that experiment is over.
The kite experiment was a scientific experiment
experiment