One day on Jupiter lasts only about 10 hours — it has the shortest day of any planet.
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The Earth's orbit determines the length of the year.
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Mercury has no substantial atmosphere to trap heat.
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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 observable universe is about 93 billion light‑years wide.
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A day on Venus is longer than its year.
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Fast radio bursts are powerful millisecond-long radio pulses from distant galaxies.
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There are rogue planets drifting through space with no star at all.
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