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What do you know?
  1. What are some similarities and differences between asteroids and comets?
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  2. Scientists suggest two ways the asteroid tails formed: the asteroid tails may have been the result of a collision, or the asteroid is spinning so fast that material is spinning off of it, creating the tails. What evidence is presented in the story to support one idea over the other?
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  3. What evidence do astronomers have for concluding that the object with tails is an asteroid and not a comet?
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