There are black holes at galaxy centers.
Fact #1714
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The event horizon marks the boundary around a black hole.
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A rhinoceros has thick skin but can still get sunburned.
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There are rogue planets drifting through space with no star at all.
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The Moon's gravity affects ocean tides.
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Time moves slower in stronger gravitational fields.
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The heliosphere protects the solar system from interstellar radiation.
Fact #1626 · Space
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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