What two elements make up over 99% of the observable universe?

Answer 1

Hydrogen and helium.

Mostly, these are the elements formed in the Big Ban,and they have been with us. Heavier elements, of course, are produced in stars by fusion, and also by even more violent events such as supernovae, but even 14 billion years after the Big Bang these processes have impacted only a small part of all the matter in the Universe.

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Answer 2

Nova Anderson

Hydrogen and helium make up over 99% of the observable universe.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.