A the interstellar medium dims by about 19 magnitudes1000pc, Ask an Expert

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a. The interstellar medium dims by about 1.9 magnitudes/1000pc. What fraction of photons survive a trip of 1000 pc?

b. If a giant molecular cloud has a diameter of 30 pc anddrifts relative to neighboing clouds at 20km/s, how long will it take to travel its own diameter?

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