The Sun will eventually burn out billions of years from now.
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The observable universe is about 93 billion light‑years wide.
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Comets orbit the Sun in elongated paths.
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The Earth spins at 1000 mph.
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Some stars explode when they die.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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The Mars Pathfinder mission tested new landing techniques.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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