Basically the “starting” elements of the universe are Hydrogen and Helium, all other elements are basically the result of fusion within stars, when these stars go supernova those heavier elements then get scattered over the nearby area and then form planets and the animals and plants that live on the planet. So until a star went supernova any planets out there were gas giants; solid / rocky planets require element from supernovas. https://youtu.be/w1GlDVt1Mpk
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