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I heard many times that in fact power output of the Sun is very low compared to it's size. But people usually consider Sun as something monstrous with almost infinite energy.
Posted by CommanderDef on Oct 7th, 2012
The Sun produces energy by running thermonuclear reactions. But most of it's mass are protons and proton+proton fusion is the least efficient of all. Of course there are reactions with complex atoms, but that is quite minority.
So, let's make a simple math. According to wiki and some more websites, power output is about 3,827×1026 Watts. Mass is said to be about 1,9891×1030 kg. That makes about 1,92x10-4 Watts per kg.
For ilustration, imagine a man of weight 100 kg. That man has to pull 19,24 gram thing one meter far from it's original position by one second to have the same watt/kg output. Right? Well, according to some sites I visited, human metabolism radiates heat (depends on temperature, weight and many other things) about 100-200 W, which is anyway much more heat/mass than our star.
Ok, now stop thinking about Sun made of human bodies xD. Funny fact, isn't it? So do you still think it is so powerful?