The observable universe contains an estimated 2 trillion galaxies.
Fact #3124
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Jupiter is the largest planet in the solar system.
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Time moves more slowly in stronger gravitational fields.
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A day on Venus is longer than its year.
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Venus has the longest day of any planet in the solar system.
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Space is completely silent.
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Some metals such as mercury are liquid at room temperature.
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The Tardigrade can survive the vacuum of space.
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The observable universe is about 93 billion light‑years wide.
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