Science

Who discovered the supernova and was the first to theorize that stars "die"?

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What organelle packages and helps in secretion of substances within the cell?
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Who discovered that a moving magnet generates electric current known as electromagnetic induction?
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What are plants that live for three or more years?
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Which of these measurements would be different on Mars than on Earth?
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What is the perception of frequency called?
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In which constellation does the vernal equinox appear?
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Which Pioneer spacecraft first visited the planet Saturn?
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What metal is used for most electrical wire and cable?
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