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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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What happens if gravity was slightly more strong?

 If gravity were slightly stronger in our universe, it would have significant implications for the structure of the cosmos, the formation of stars and galaxies, and the evolution of planetary systems. Here are some of the potential consequences:

1. Stellar Evolution: Stronger gravity would lead to more massive stars forming from collapsing molecular clouds. These stars would burn through their nuclear fuel more quickly and end their lives in more violent events such as supernovae or even directly collapsing into black holes. The lifespan of stars would be shorter overall.

2. Galaxy Formation: Galaxies form through the gravitational collapse of matter in the early universe. If gravity were stronger, galaxies would form more quickly and be more tightly bound. The distribution of galaxies throughout the universe might be different, potentially affecting the large-scale structure we observe.

3. Planetary Systems: Stronger gravity could influence the formation and stability of planetary systems. Planets might form more quickly and be more massive, potentially leading to different compositions and sizes. Orbits might also be affected, with planets either being closer to their parent stars or having more eccentric orbits.

4. Surface Conditions: On planets, stronger gravity would result in higher surface pressures and temperatures. This could affect the geological activity and climate of the planet, potentially making it more hostile to life as we know it. The shapes of mountains and landscapes might be different due to the increased pressure.

5. Escape Velocity: With stronger gravity, the escape velocity from celestial bodies would be higher. This would make space travel more challenging and require more energy to leave a planet's surface or escape the gravitational pull of a star.

6. Cosmological Consequences: On a cosmological scale, stronger gravity could affect the expansion rate of the universe and the eventual fate of the cosmos. It might lead to a universe that collapses back on itself in a "Big Crunch" scenario sooner than in our current understanding.

Overall, a slightly stronger gravitational force would have far-reaching consequences for the universe's structure, the behavior of celestial objects, and the potential for life on planets. It would create a cosmos that is significantly different from the one we observe today.


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