The Mars rovers Spirit and Opportunity were designed for 90-day missions but operated for 6 and 14 years respectively.
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The universe is estimated to be about 13.8 billion years old.
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The observable universe is about 93 billion light‑years wide.
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The light you see from some stars today began traveling before humans existed.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Moon has no breathable atmosphere.
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