None.
Stars are not powered by combustion; they are powered by nuclear fusion, which is a fundamentally different and far more energetic process.
Stars are powered by nuclear fusion
Yes, nuclear fusion
Planets do not naturally generate nuclear fusion. Nuclear fusion occurs in stars, where the extreme heat and pressure at the core allows hydrogen nuclei to merge and form helium, releasing energy in the process. Planets lack the conditions necessary for sustained nuclear fusion reactions.
The stars are powered by nuclear fusion, so this is widespread. Nuclear fission is more unusual and probably only occurs in certain planets where there is a lot of uranium.
thermonuclear fusion
Stars are powered by nuclear fusion
No. The sun is powered by nuclear fusion.
Gaseous planets
false
No, none of the planets are big enough for that
No, only large stars go supernova when nuclear fusion breaks down. While white dwarfs can go supernova in some instances, brown dwarfs are failed stars which are not powered by nuclear fusion.