The outer planets Jupiter, Saturn, Uranus, and Neptune are mostly gas and ice — they have no solid surface.
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Venus has a thick atmosphere that traps heat.
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The Sun accounts for more than 99% of the mass of our solar system.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The observable universe is about 93 billion light‑years wide.
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Saturn could float in water because its density is low.
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The Moon was likely formed after a massive collision with early Earth.
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Saturn's largest moon is Titan.
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