Science
What satellite series was known as "fellow traveler"?
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What is any picture of an object made with a mirror or lens called?
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What was the name of the first artificial satellite launched into space?
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What university did astronomy and space science theorist Carl Sagan teach at?
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How many times more does Jupiter radiate energy than what it receives from the sun?
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What is the sticky bacteria that forms on teeth and gums?
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Deep trenches such as the Grand Canyon were formed by what process?
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