The Voyager Golden Record was sent into space containing sounds and images from Earth.
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The observable universe is about 93 billion light‑years wide.
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Neutron stars can collide and produce heavy elements.
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Cosmic microwave background radiation is evidence of the early universe.
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The Earth's magnetic field protects against solar radiation.
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Black holes can slow time so much that seconds near them equal years far away.
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The Sun accounts for more than 99% of the mass of our solar system.
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The Moon's surface temperature varies dramatically.
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