[681] Gravity Wells

Title Text:This doesn’t take into account the energy imparted by orbital motion (or gravity assists or the Oberth effect), all of which can make it easier to reach outer planets. Origin:https://xkcd.com/681/ https://www.explainxkcd.com/wiki/index.php/681:_Gravity_Wells 漫画显示了太阳系中每颗行星位置的引力势(由重力引起的每单位质量传递的能量),包括一些卫星和土星环。沿着向上的斜坡行进的物体失去能量,而沿着向下的斜坡行进的物体获得能量。 逃离行星或月球的轨道需要足够的能量(例如通过… Read more

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