How are light ellements formed?
In stars the same size as our sun, fusion between the nuclei of hydrogen produces light ellements to be formed during the main star sequence. This nucleur fusion process gives out large amounts of energy in the form of heat and light.
How are heavy ellements (heavier than iron) formed?
When large stars die the core of the star is compressed into a neutron star. The energy from this is used to fuse light ellements into heavy ellements. These ellements are scattered accross the universe when the large star explodes in a supernova.
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