The International Space Station is visible to the naked eye from Earth.
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The event horizon marks the boundary around a black hole.
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Mercury has no substantial atmosphere to trap heat.
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The International Space Station orbits Earth every 90 minutes.
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Supernovae can briefly outshine entire galaxies.
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The observable universe is about 93 billion light‑years wide.
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The Milky Way is estimated to be over 100,000 light-years wide.
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There are rogue planets drifting through space with no star at all.
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The Earth's gravity keeps the Moon in orbit.
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