diff --git a/sim_scenes/featured/jupiter_moon_protects_earth.py b/sim_scenes/featured/jupiter_moon_protects_earth.py
index e981361306463b3d4dbf110eb1dd47423430f670..284d4479dc36922e40f07f2d188949963ab6c6aa 100644
--- a/sim_scenes/featured/jupiter_moon_protects_earth.py
+++ b/sim_scenes/featured/jupiter_moon_protects_earth.py
@@ -191,6 +191,10 @@ class JupiterMoonProtectsEarthSim(UniverseSimScenes):
                 if collided:
                     # 如果碰撞了，则该石头重复再利用，这样才保证有无限个石头可用
                     pos, vel = self.random_pos_vel()
+                    comet.planet.on_reset()
+                    comet.planet.trails.clear()
+                    if hasattr(comet.planet, "trail_last_pos"):
+                        delattr(comet.planet, "trail_last_pos")
                     comet.init_position = pos
                     comet.init_velocity = vel
                     comet.set_visible(True)
@@ -290,7 +294,7 @@ if __name__ == '__main__':
     # 使用 ursina 查看的运行效果
     # 常用快捷键： P：运行和暂停  O：重新开始  I：显示天体轨迹
     # position = 左-右+、上+下-、前+后-
-    ursina_run(sim.bodies, SECONDS_PER_MONTH / 6,
+    ursina_run(sim.bodies, SECONDS_PER_MONTH / 2,
                position=(AU, AU * 5, -AU * 5),
                cosmic_bg='',
                show_grid=False,