The Viking landers in 1976 were the first spacecraft to successfully operate on Mars's surface.
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Mercury has no substantial atmosphere to trap heat.
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Cosmic microwave background radiation is evidence of the early universe.
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Jupiter has a magnetic field stronger than Earth's.
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Saturn could float in water because its density is low.
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The Earth's magnetic field helps prevent atmospheric loss.
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The universe has no center.
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The observable universe is about 93 billion light‑years wide.
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Mercury has extreme temperature differences.
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