谢谢你的邀请！这个问题需要你把《雷神3》和《复仇者联盟3》连起来看！《雷神3：诸神黄昏》里雷神为了对抗海拉，让洛基用永恒之火复活了火焰巨人苏尔特尔，洛基在永恒之火的路上看见了宇宙魔方，这里给的镜头只是洛基扫了一眼宇宙魔方并没有拿，然后就去用永恒之火复活火焰巨人苏尔特尔了！可以观看下面的视频：
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然后咱们回到《复仇者联盟3：无限战争》里，在《复联3》一开场的情节里就是雷神的飞船遇见了灭霸（其实这个在《雷神3》的彩蛋里有铺垫），洛基为了救雷神把宇宙魔方交给了灭霸（其实洛基打算用绿巨人浩克扛一下，但是浩克真的扛不住啊！可以观看下面的视频：
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结果导致灭霸获得了第二个无限宝石（空间宝石）。可以观看下面的视频：
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这样你应该就清楚了宇宙魔方的去向了！至于永恒之火，应该是还在阿斯加德，虽然阿斯加德毁灭了，但是永恒之火嘛，肯定是永恒的，o(∩_∩)o哈哈~