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Is it scientifically correct to say that the universe has cooled down ever since the Big Bang?

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What did the moon look like on September 15, 1964?

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What did the earth look like when the dinosaurs lived?

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Suppose the sun suddenly disappears, would the earth immediately change course or will it take 8 minutes for the earth to notice that the...

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How many km can you cover if you stand on the beach and look at the horizon, over the sea?

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What makes a gas planet different from an ordinary planet eg Earth?

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will the planet jupiter ever become a sun?

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How come you feel the sun less at night when it shines right in your face?