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Why doesn’t a nuclear bomb create a chain reaction that destroys the entire planet?

  Because real life is not Hollywood plus 4 reasons. Fission vs. Fusion : Nuclear bombs work on the principle of nuclear fission – splitting heavy atoms like uranium or plutonium. This releases energy, sure, but to destroy the entire planet? Not enough oomph. What you'd need is a fusion reaction, the kind that fuels stars. That involves lighter atoms like hydrogen fusing, and it's way more powerful. Think of fission as a firecracker, fusion as the sun. We're nowhere near making a fusion bomb as big as our planet. The Limits of Chain Reactions : Even in a fission bomb, the chain reaction doesn't run wild forever. The explosion itself scatters the nuclear fuel, disrupting the critical mass needed to sustain the reaction. It's like trying to keep a bonfire going by throwing the logs across the field. Dissipation of Energy : The colossal energy released by a nuke mostly disperses as heat, light, and a shockwave. Earth is just way too big to absorb all that and go kabloo...
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Why is it difficult to fathom the Big Bang Theory? How could you have something from nothing?


The Big Bang theory (or rather, the Lambda-CDM model, its actual formal name) does not say everything came from nothing. 

It states that Cosmic Microwave Background Radiation (CMB) allows light to freely travel and energy to flow, like the faint glows in the sky which we see in the sky are CMB's only, or like the Northern Lights are a more visible form of CMBs. And it predicted that the formation of the first CMB happened around 13.3 Billion years ago, and from that prediction, they assumed that light needed to attain a certain range of temperature to attain, and the universe cooled down after about 380,000 years of expansion, which resulted in a lot of heat loss.

From the knowledge of CMB, Scientist predicted that as the universe expanded and cooled, elementary particles formed, eventually leading to the formation of protons, neutrons, and electrons. These particles then combined to form atoms, primarily hydrogen and helium. 
And, some newspapers and magazines misinterpreted the model to think universe began from the so-called 'singularity'.
The Official paper does not even contain the word Singularity. The possible explanation for such misunderstanding is the misinterpretation of this statement Sandra Moore Faber in 1984 which is;

"The universe has undergone a rapid expansion which has caused space itself to stretch, cooling the universe as it expanded."

So there’s your answer. It’s difficult to understand because people with no formal educational background in cosmology hold weird ideas about what it says, ideas they get from a bizarre combination of bad pop sci reporting and garbled nonsense from their preachers. 

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