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What is the Sun made of?
1. 70 percent helium, 28 percent hydrogen, 2 percent other elements
2. 100 percent hydrogen and helium
3. 70 percent hydrogen, 28 percent helium, 2 percent other elements
4. 50 percent hydrogen, 25 percent helium, 25 percent other elements
5. 98 percent hydrogen, 2 percent helium and other elements

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