How long will it take to travel its own diameter

Reference no: EM13563436

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?

Reference no: EM13563436

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