标题：地球能否承受住所有铀235的集中引爆？
正文：近日，一项关于地球安全的假设性问题引发了广泛关注。问题是：如果把地球上所有的铀235集中起来，做成一个大核弹，放到马里亚纳海沟里引爆，地球会不会被炸成两半？这个问题虽然看似荒谬，但实际上涉及到了地球物理学和核物理学的一些基本原理。
首先，我们需要明确的是，地球上的铀235资源是有限的。根据科学家的估计，地球上的铀235总量大约为140万吨。即使我们把所有的铀235都集中起来，也无法制造出足够大的核弹来引发全球性的灾难。
其次，即使我们能够制造出这样一颗核弹，也并不意味着地球会被炸成两半。地球的内部结构是非常复杂的，包括地壳、地幔和地核等多个层次。而且，地球的质量非常大，其引力也会对爆炸产生强大的阻力。因此，即使有如此巨大的能量释放，地球也可能只是会发生一些局部的地质变化，而不会被炸成两半。
最后，我们也需要考虑裂变弹的理论上线。裂变弹的能量释放是受到一定限制的，超过这个限制，裂变弹就无法继续释放能量。因此，即使我们把所有的铀235都用来制造核弹，也无法达到这个理论上线。
英语如下：
Title: Can the Earth withstand the power of nuclear fission if all the uranium 235 on Earth is concentrated and detonated in the Mariana Trench?
Keywords: Nuclear bomb detonation, Earth splitting, Uranium-235 fission
Content: Title: Can the Earth withstand the explosion of a large nuclear bomb made from all the uranium 235 on Earth if it is detonated in the Mariana Trench?
Body: Recently, a hypothetical question about global security has attracted widespread attention. The question is: If all the uranium 235 on Earth were gathered together to make a large nuclear bomb and detonated in the Mariana Trench, would the Earth be split in two? Although this question may seem absurd, it actually involves some basic principles of geophysics and nuclear physics.
Firstly, we need to clarify that the uranium 235 resources on Earth are limited. According to scientists’ estimates, the total amount of uranium 235 on Earth is approximately 1.4 million tons. Even if we gather all the uranium 235, we cannot create a large enough nuclear bomb to cause a global disaster.
Secondly, even if we could create such a nuclear bomb, it does not mean that the Earth will be split in two. The internal structure of the Earth is very complex, including multiple layers such as the crust, mantle, and core. Moreover, the mass of the Earth is very large, and its gravity will also generate strong resistance to the explosion. Therefore, even with such a huge energy release, the Earth may only experience some local geological changes and not be split in two.
Finally, we also need to consider the theoretical upper limit of fission bombs. The energy release of a fission bomb is subject to certain limitations; beyond this limit, the fission bomb cannot continue to release energy. Therefore, even if we use all the uranium 235 to make a nuclear bomb, we cannot reach this theoretical upper limit.
【来源】https://www.zhihu.com/question/601882469
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