Dark matter is believed to make up most of the universe’s mass but has not been directly observed.
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A day on Venus is longer than its year.
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The Moon's gravity affects ocean tides.
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The Earth's gravity affects the movement of tides.
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Neptune is known for its deep blue color.
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The observable universe is about 93 billion light‑years wide.
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Light from distant galaxies shows us the past.
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In 1859, a powerful solar storm disrupted telegraph systems across the world.
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The Earth orbits the Sun once every year.
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