The observable universe is about 93 billion light‑years wide.
Fact #1989
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Mercury has no substantial atmosphere to trap heat.
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The Moon's gravity influences ocean tides.
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Time moves slower in stronger gravitational fields.
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Comets can develop long tails when near the Sun.
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The Earth orbits the Sun once every year.
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The Earth's gravity keeps the Moon in orbit.
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The International Space Station orbits Earth every 90 minutes.
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