1. It has been suggested that humans may someday mine the asteroids for materials to build and…

1. It has been suggested that humans may someday mine the asteroids for materials to build and supply space colonies. What kinds of materials could Earthlings get from asteroids? (Hint: What are S-, M-, and C-type asteroids made of?) 2. If cometary nuclei were heated during the formation of the solar system by internal radioactive decay rather than by solar radiation, how would comets differ from what is observed? 3. Do you think the government should spend money to fi nd near-Earth asteroids? How serious is the risk?  

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