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When rocket motors are not burning and attitude thrusters are not firing, the only force acting on a spacecraft is the gravitational attraction toward every mass in the universe. Since those forces completely determine the speed and direction of the spacecraft, it's pretty important to take gravity into consideration. If the mission planner is smart, he'll usegravity to help take the spacecraft where it has to go, which cuts down on how much rocket fuel it needs.

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16y ago

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