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Successful irradiation doubles the production of a random [[Colonies|'''colony''']]. Unsuccessful irradiation yields some [[Resources#Bacteria|Bacteria]]. One colony can be irradiated multiple times.
It is only possible to irradiate colonies that you have purchased at least once before. If every colony has been purchased at least once, then each colony has the same probability of being irradiated.
The irradiation effect is not lost when entering a '''[[Black Hole]]''' or attacking a [[Planets|'''planet''']].
Only one irradiation type can be researched at a time.