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Attacking a planet uses up all [[Resources#Bacteria|'''Bacteria''']] and [[Resources#Nanobots|'''Nanobots''']], and resets [[Colonies|'''colonies''']] and [[Upgrades|'''bacteria upgrades''']]. Destroying planets unlocks new upgrades and features, such as [[Research#Colony Irradiation|Colony irradiation]] or [[Research#Nanobot Production|Nanobot production]].
A planet counts as destroyed if its remaining population has been reduced to 0. Killing a percentage of a planet's population earns '''[[Gene Strands]]''' and there is no limit to how many times the player can attack one planet to destroy it. However, it's not possible to attack a planet if the player cannot gain even 1 Gene Strand or if he has less than 1 Bacteria.
Each subsequent planet also increases in population and defenses.<br><br>