I Nuclear fission

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Is there any phenomenon in nature that resembles or is analogous to nuclear fission?
 
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Yes: Nuclear fission is a natural process.

If you mean nuclear chain reactions, the answer is still also nuclear chain reactions.
We usually think of nuclear fission as man-made nuclear fission, which releases a great amount of energy. Could you give an example of commonly occurring natural nuclear fission?

That natural nuclear chain reactions occurred on earth is indeed remarkable.
 
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We usually think of nuclear fission as man-made nuclear fission, which releases a great amount of energy. Could you give an example of commonly occurring natural nuclear fission?
It's the same process. Uranium nuclei everywhere can fission spontaneously. A few other nuclei can do so as well but they are very rare in nature.
Nuclear reactors use chain reactions to get much higher rates of fission, enough for a power plant or whatever else the application is.
 

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