The universe is estimated to be 13.8 billion years old.
Fact #3303
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The Earth orbits the Sun at about 30 kilometers per second.
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The International Space Station is one of the most complex engineering projects ever built.
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Mercury has no substantial atmosphere to trap heat.
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The observable universe is about 93 billion light‑years wide.
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Project Blue Book investigated reports of unidentified flying objects.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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Neutron stars can collide and produce heavy elements.
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Black holes can slow time so much that seconds near them equal years far away.
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