If a dense, non-light producing, interstellar has were to move between a star and earth, what would happen to the spectra if the light from the star as measured on earth?

Do you think the gene eef1 alpha1 supports cell theory? explain your response.

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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?