What made the universe?

The stars are almost 100% consist of hydrogen and helium - the simplest and easiest chemical elements. The rest of the elements are quite rare. But some - carbon, oxygen, silicon, nitrogen and iron - can form important compounds. Exactly this happens on a few planets, similar to Earth, where iron, oxygen and magnesium occur more often than the rest of the elements. All forms of life are based on the presence of a more rare element - carbon.

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