Venus is the hottest planet — not Mercury — because its thick CO₂ atmosphere traps heat.
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Cosmic rays constantly bombard Earth from space.
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Light from distant galaxies shows us the past.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The Voyager Golden Record was sent into space containing sounds and images from Earth.
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Mercury has no substantial atmosphere to trap heat.
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The light you see from some stars today began traveling before humans existed.
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