The first stars in the universe were massive, metal-free, and burned out within a few million years.
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The observable universe is about 93 billion light‑years wide.
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The Sun occasionally emits powerful solar flares.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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There are rogue planets drifting through space with no star at all.
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Saturn's largest moon is Titan.
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Dark matter is believed to make up most of the universe’s mass but has not been directly observed.
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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 Earth's gravity keeps the atmosphere in place.
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