Science

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

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What was the name of the first artificial satellite launched into space?
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What metal is used for most electrical wire and cable?
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Which planet in Earth's solar system has the largest diameter?
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What kind of electromagnetic radiation arises only from nuclear excitations?
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John Glenn was the first American to orbit the earth, in how long a flight?
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What means having two eyes facing forward?
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How many major time zones does the earth have?
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A unit of electromotive force is called what?
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