The rings of Saturn are mostly made of chunks of ice and rock, some as small as grains of sand and others as large as houses.
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Some stars collapse into black holes at the end of their life cycle.
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Some stars appear to dim irregularly for reasons that are still studied.
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Some galaxies appear distorted due to gravitational effects.
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The light you see from some stars today began traveling before humans existed.
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The observable universe is about 93 billion light‑years wide.
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Saturn's largest moon is Titan.
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The International Space Station orbits Earth roughly every 90 minutes.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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