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What Is The Most Abundant Element In The Universe?
Carbon
Silicon
Oxygen
Hydrogen

Answer: Hydrogen

If there’s one thing the observable universe has a whole lot of, it’s hydrogen. Cosmological observations and careful astronomical calculations indicate that roughly 74% of baryonic matter in the universe is composed of hydrogen. This puts it leaps and bounds ahead of the next nine most-abundant elements: helium, oxygen, carbon, neon, iron, nitrogen, silicon, magnesium, and sulfur. The mass of all those elements combined doesn’t even begin to approach half the amount of hydrogen.

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