Final answer:
The most common elements in the universe are the lightest elements like hydrogen and helium. Heavier elements are much rarer and are formed through processes like supernova explosions or neutron star mergers.
Step-by-step explanation:
The most common elements in the Universe are also the lightest elements. The most abundant elements in the Universe are hydrogen and helium. These two elements make up over 98% of all the atoms in the universe.
These elements are also the building blocks of stars. Stars are mainly made up of hydrogen, which undergoes nuclear fusion to form helium and release a tremendous amount of energy in the process.
On the other hand, the heaviest elements are much rarer in the Universe. They are formed through processes like supernovae explosions or neutron star mergers. These processes generate intense heat and pressure that allow the creation of heavier elements beyond helium.
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