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PHY150 Test #4 Exam Questions with correct answers
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PHY150 Test #4 Exam Questions with correct answers stars form from gas and dust that make up the ________ - interstellar medium the interstellar medium is made mostly of ________ and ________ and 1% metals - hydrogen; helium Over large distances, the interstellar medium scatters or absorbs short wavelengths, leading to __________ - interstellar reddening a smaller dense region is a __________ - nebula Dark nebula __________________ from stars behind them - blocks light emission nebula glow as they _________ - emit light
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