引力游乐场POCKET COSMOS
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这是使用软化牛顿引力与速度 Verlet 积分的平面沙盒。所有天体互相影响，碰撞时按质量与动量守恒合并；碰撞不守恒机械能。「黑洞」是吸收天体的高质量引力源，光环为视觉效果，没有模拟相对论。
最多 48 个天体；远离中心超过 100 单位的天体会离场。虚线预测暂时固定其他天体的位置，仅供试射参考。示例和颜色由本文件生成，无需联网。
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