/r/askscience
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How come we are able to detect planets thousands (millions?) of light years away from us, but we have yet to determine with 100% certainty whether or not there is a ninth planet in our solar system?
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In the absence of cosmic radiation, would an object placed in space eventually cool to absolute zero?
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Question about procrastination/the psychology of decision making: What causes people to stop procrastinating and take action instead of continuing to procrastinate?
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