The Milky Way galaxy contains billions of stars.
Fact #25
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A sea star can regrow lost arms.
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The Earth's gravity keeps the Moon in orbit.
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The Sun accounts for more than 99% of the mass of our solar system.
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Quasars are extremely bright objects powered by supermassive black holes.
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The observable universe is about 93 billion light‑years wide.
Fact #1819 · Space
Time moves more slowly in stronger gravitational fields.
Fact #1618 · Space
Black holes can slow time so much that seconds near them equal years far away.
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There are rogue planets drifting through space with no star at all.
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