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Astronomy & Space
Explore the universe — planets, stars, black holes, and the big bang.
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What is a light-year?
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The distance light travels in one year — approximately 9.46 trillion kilometers (5.88 trillion miles). Used to measure astronomical distances.
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What is a black hole?
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A region where gravity is so strong that nothing, not even light, can escape. Formed from collapsed massive stars. Defined by the event horizon.
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What are the planets in our solar system (in order)?
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Mnemonic: My Very Educated Mother Just Served Us Nachos.
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What is the Big Bang theory?
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The universe began ~13.8 billion years ago from an extremely hot, dense state and has been expanding ever since. Supported by cosmic background radiation and redshift.
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What is the difference between a star and a planet?
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Stars generate energy via nuclear fusion (hydrogen → helium). Planets orbit stars and do not produce their own light — they reflect starlight.
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What is the Milky Way?
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A barred spiral galaxy containing our solar system. ~100,000 light-years in diameter with 100-400 billion stars. Our Sun is in the Orion Arm.
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What is dark matter?
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Invisible matter that doesn't emit light but exerts gravitational force. Makes up ~27% of the universe. Detected through its gravitational effects on visible matter.
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What is a neutron star?
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The collapsed core of a massive star after a supernova. Incredibly dense — a teaspoon weighs ~6 billion tons. Some spin rapidly (pulsars) emitting radiation beams.
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