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Each subsequent planet also increases in population and defenses.<br><br>
After entering a '''[[Black Hole]]''', the player enters an alternate timeline where none of the planets have been destroyed. The planets in the alternate timeline have the same stats and defenses, but can unlock different features. For example, destroying the fifth planet after the first Black Hole unlocks [[Research#Bacteria Irradiation|'''Bacteria irradiation''']].
The first 34 planets have unique descriptions and artwork, but the others are generated automatically.