Science

Earthmen first sent a spacecraft to which planet?

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In which year was Hubble's Law formulated?
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Which man-made waterway is 100.76 miles long?
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Who is credited with creating the "Big Bang Theory"?
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What vascular plants do not have seed-bearing flowers or fruits?
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What type of simple machine is used on a flag and flag pole?
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Which of these is a type of wetland?
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Where would you find the zone of polarizing activity?
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What tool do people at sea use to measure distance with echoes?
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