The Sun accounts for 99.86% of all mass in the solar system.
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The Moon always shows the same face to Earth.
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There are rogue planets drifting through space with no star at all.
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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 International Space Station travels at about 28,000 kilometers per hour.
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The Sun occasionally emits powerful solar flares.
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The observable universe is about 93 billion light‑years wide.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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Black holes can slow time so much that seconds near them equal years far away.
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