Why would the nuke trigger a chain reaction and destroy the planet?

Question

I have heard of this theory a bunch before, but I don’t really understand chemistry of physics enough to make sense of it.

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Answer 1

Once a nuclear bomb has enough stuff (critical mass) it starts a chain reaction. Which can be thought of as a domino chain. The brief fear that scientists had was once this first domino fell the chain reaction would not be contained to the stuff that was inside the bomb and this chain reaction could affect atoms in the atmosphere. I don’t have a full grasp of nuclear physics to understand why it didn’t however