Comments by "" (@MonkeyJedi99) on "The Super Weapon That Could Destroy Planet Earth" video.
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Blowing up planets in the habitable zone of a star is stupidly wasteful.
If you have a long time before you need the planet for your own uses, throw lots of cheap rocks. You take out the life that is there, and after things settle and cool, it's ready for what you want to put on it.
If you need that planet in less than a generation, but a few years is fine, you can select from options like biological warfare, changing the chemistry of the planet with carefully selected impactors, or using large reflectors to increase the temperature of the environment for a while to kill off the pesky native infestation.
If you need the planet quickly, inciting internal political and military action is cheaper and faster, but can be unpredictable, forcing you to more extreme methods.
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