The speed at which galaxies move apart increases with distance due to the expansion of space itself.
Fact #2443
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Comets can develop long tails when near the Sun.
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The observable universe is about 93 billion light‑years wide.
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The Earth's rotation causes day and night cycles.
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The Earth's atmosphere gradually thins into outer space.
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The observable universe is about 93 billion light‑years wide.
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The universe is expanding faster.
Fact #1708 · Space
Black holes can slow time so much that seconds near them equal years far away.
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The universe has no center.
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