Neither.
Acceleration due to gravity on the surface of the sun or moon will not be 9.8 metres per sec squared.
The second is not true because there are subatomic particles that (by definition) cannot be composed of atoms. Furthermore, astrophysicists are still not sure that they have accounted for all the matter in the universe. The Higgs boson, for example, has not yet been confirmed.
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the answer is complement
about 13.7 Billion years
This is called the complement of the set.
1: The Big Bang Theory, 2: Evolution, 3: The Universe is Big.
Since the numbers astronomers use are often very large or very small, they frequently use scientific notation to describe sizes and sentences in the universe.