The most common element in the universe is hydrogen and when accumulated in large amounts with the help of gravity hydrogen atoms will fuse together forming a new element helium and energy. This type of fusion is what is happening on the sun every second. Millions of tons of hydrogen are being converted into millions of tons of helium and there is a lot of engery given off. This is according to Einstein's mathmatical formula E=MC2. If the planet is big enough and has enough gravity heavier elements will be formed until Lead is formed. The millisecond lead is formed the planet will die and blow up and be the death of the star. So how do we get any elements heavier than lead? That requires a very large star called a super nova which is so massive that the elements continue to fuse creating h