Why no fission on sun?
The Sun get it power by nuclear FUSION not by nuclear fission.
Looking at it very simplistically, the sun contains an enormous amount of hydrogen inside which through the nuclear fission process produces helium. The process of fission (combing of 2 hydrogen atoms into 1 helium atom) releases tremendous amount of energy. The energy is equivalent to the mass that is lost in the fission process.
I question why this is in the "Japan in WW2" section, but regardless. No, the sun is obviously not a bomb. However, you probably meant to ask something like, does the sun behave similar to an atomic bomb. The answer is, kinda. Most a-bombs use fission, while some use small fission reactions to create a fusion reaction, and are thus similar to the fusion reaction which makes the sun what it is.
What is the difference between nuclear fusion in the sun and nuclear fission in a power plant on earth?
In the so-called "hydrogen bomb" or fusion bomb, yes, there is energy released from the same reaction (hydrogen fusing to helium) as in the Sun. However, many if not most atomic bombs are fission bombs that do not involve fusion. In a fission bomb, the nuclei of uranium atoms are split, converting some of their mass to energy. All current fusion bombs include fission reactions to trigger the greater energy release from fusion. But most…
The sun may have started from the nebula of our solar system. The nebula was mostly made of dust and gasses, and slowly condensed most of it's materials to one area, and eventually, pressure was great enough that nuclear fission could occur. Nuclear fission is a continuing explosion that provides the sun with energy, and light. That's how the sun was formed! ~The rest of the material of the nebula formed the rest of the…