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Classify each statement below as an observation or as an inference based on the current big bang model. (note that the helium abundance is defined as the mass of helium relative to the mass of hydrogen.)
1. photons of the cosmic microwave background have traveled through space for almost 14 billion years.
2. the cosmic microwave background is radiation left over from the big bang.
3. large-scale structures look about the same in all directions.
4. the temperature of the cosmic microwave background varies slightly with direction.
5. the cosmic microwave background temperature is 2.73 k.
6. the helium abundance is at least 25% in every galaxy studied so far.
7. fusion during the universe's first five minutes produced 75% hydrogen and 25% helium.
8. large-scale structure grew around density variations present in the early universe.
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