Asteroids and Comets quiz
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What injured most people in Russia's 2013 meteor blast?
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More questions about Asteroids and Comets
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Where do most meteor showers come from?
Answer: Comet dust
Why: The Geminids are a rare exception: their dust comes from 3200 Phaethon, a rocky object usually classed as an asteroid.
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Where are most long-period comets thought to come from?
Answer: Oort cloud
Why: Short-period comets, which loop the Sun in under 200 years, come mainly from the Kuiper belt beyond Neptune instead.
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Which asteroid was first confirmed to have its own moon?
Answer: Ida
Why: Ida's moon is called Dactyl, after the mythical Dactyls who lived on Mount Ida on Crete.
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How big is the space rock behind a typical shooting star?
Answer: A grain of sand
Why: A speck that small can still light up the sky because it slams into the air at 11 to 72 km per second.
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What is it called when comet ice turns straight into gas?
Answer: Sublimation
Why: In the near-vacuum of space the pressure is too low for liquid water, so comet ice skips the liquid stage.
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What is the inside of asteroid Bennu like?
Answer: Loose rubble
Why: The layer just under Bennu's surface holds about twice as much empty space as the asteroid as a whole.
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