Earth is the only planet not named after a god in Roman or Greek mythology.
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Some pulsars emit beams of radiation like cosmic lighthouses.
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The observable universe is about 93 billion light‑years wide.
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Black holes can slow time so much that seconds near them equal years far away.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Sun occasionally emits powerful solar flares.
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Venus is sometimes called Earth's sister planet.
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The light you see from some stars today began traveling before humans existed.
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The Moon has no atmosphere like Earth's.
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