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Attacking a planet uses up all [[Resources#Bacteria|Bacteria]] and [[Resources#Nanobots|Nanobots]], and resets [[Colonies|colonies]] and bacteria [[Upgrades|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 [[Resources#Gene Strands|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 one gene strand or if he has less than 1 bacteriaBacteria.
Each subsequent planet increases in population and defenses.
=Population=
Each planet has a larger population than the previous one. Killing a portion of a planet's population earns the player [[Resources#Gene Strands|Gene Strands]]. The higher the population, the more Gene Strands can be earned from completely destroying the planet. For example, destroying Mars earns the player 10 gene strandsGene Strands, but a more populated planet like Mercury gives 85 gene strandsGene Strands.
It's possible to view the population of previous planets since the last [[Black Hole]] in the Destroyed Planets panel.