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Kurzgesagt – In a Nutshell
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Comments by "" (@charlesvan13) on "The Most Insane Weapon You Never Heard About" video.
They typically encase the second stage with U238, which is not radioactive or useful as reactor fuel, but will fission when hit with the neutrons from the secondary. This is where much of the destructive energy from an H-bomb comes from.
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10 billion tonnes of TNT would be 10,000 mt. which would be 100 Tzar Bombs. I don't think that would actually destroy the Earth. There have been volcanic eruptions more powerful than that, eg. Toba.
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Modern nukes are generally less powerful than those say in the 1960s. A typical US warhead is the W88, which is a 5 feet tall, 18 in in diameter and weights about 300kg. They can put 5-10 of them on a single missile, launched from a submarine. And 10 separately targetable 475 kt nukes are much more effective than a single 4.75 mt nuke.
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Something like 3/4 of the destructive power from a typical thermo nuclear bomb comes from fission, fission caused by the secondary. So they can build small nukes, multiple on a single missile.
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