There are signals in space older than Earth itself.
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The Earth's core temperature rivals the surface of the Sun.
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Space is completely silent.
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The International Space Station travels at about 28,000 kilometers per hour.
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The event horizon marks the boundary around a black hole.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The Earth's magnetic field protects against solar radiation.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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