Science
What percent of the Sun, by weight, is helium?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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What are solid particles that produce color by absorbing or reflecting light called?
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What organelles are also known as the powerhouses of the cell?
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What kind of electromagnetic radiation arises only from nuclear excitations?
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What is the smallest possible electricity within an atom called?
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Who was the scientist to propose the three laws of motion?
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Ian Shelton, who discovered Supernova 1987A, while observing in Chile, was working for what university?
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