The International Space Station is visible to over 90% of the human population at some point during its orbit.
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The event horizon marks the boundary around a black hole.
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The Earth's orbit determines the length of the year.
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The Milky Way is estimated to contain hundreds of billions of stars.
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Fast radio bursts are powerful millisecond-long radio pulses from distant galaxies.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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The Earth's magnetic field shields the planet from solar wind.
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Some exoplanets orbit two stars at once.
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