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The Physics of Space Fights - attacking planets


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blog-0065887001397174071.jpgThe final aspect of space fighting that I will discuss here is attacking another planet from space. Once we have destroyed or gotten past the enemies fleet an invasion force would attack the planet that they wanted to conquer. Attacking from space would be tremendously useful. It would be a simple matter to toss large aerodynamic "spears" down at the enemy. Due to conservation of energy, the gravitational potential energy the projectiles have at launch would be converted to kinetic energy in the spear causing our weapon to create devastating craters whenever they landed. Although there would be some losses to friction in the atmosphere this would be negligible. This would make it very easy to destroy a planets defenses, but actually taking control of the planet itself would be mush more difficult. Any invasion force that was sent down would have to stay there because of the difficulty in escaping a planets atmosphere. Therefore the invasion would have to happen very quickly and could involve only a small fraction of the invasion force (since most of the fleet is required to maintain control of the space around the planet and therefore can not enter the atmosphere.

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