The universe contains billions of galaxies, each of which contains billions of stars. suppose you observed a galaxy through a telescope. it has arms that wind outward from its center like a pinwheel. how would you classify the galaxy? a. irregular b. elliptical c. spiral d. barred spiral 1
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Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?
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The universe contains billions of galaxies, each of which contains billions of stars. suppose you ob...
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