The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The observable universe is about 93 billion light‑years wide.
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The observable universe is about 93 billion light‑years wide.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Venus has surface temperatures hot enough to melt lead.
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The light you see from some stars today began traveling before humans existed.
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The universe is expanding faster.
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Neptune appears blue because of methane in its atmosphere.
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Black holes can slow time so much that seconds near them equal years far away.
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