A20年前,外星人妄图在独立日占领地球的企图被开挂的人类加主角光环挫败了。20年后,《独立日2》里卷土重来的外星人技术没什么长进,战术好像反而更后退了,但倒是有一个好:终于暴露了他们的真实目的。哦,原来是来偷地雷,哦不,偷地核的。按他们自己的说法,偷走的目的是作为能源。地核的主要成分是铁镍合金。的确,地核的温度是挺高的,哪怕最外圈也有大概4000摄氏度,往里更能高到6000度。但是内能简直是性价比最低的能量了,何况铁和镍的比热容只有水的十 A20 years ago, aliens vainly attempted to occupy the Earth on Independence Day and were hanged by a halo of human protagonists frustrated. Twenty years later, extraterrestrial alien technology on Independence Day 2 did not make much progress. The tactics seemed to have taken a step back, but there was a good one: they finally revealed their true purpose. Oh, the original is to steal the landmine, oh, steal nuclear. According to their own statement, the purpose of stealing is as energy. The main component of the core is iron-nickel alloy. Indeed, the temperature of the core is quite high, even if the outermost circle is about 4000 degrees Celsius, which can be as high as 6000 degrees. But the energy is simply the lowest cost energy, not to mention the specific heat capacity of iron and nickel only water ten