The density of the interstellar medium in our Galaxy is measured to be (10^{-21} mathrm{~kg} mathrm{~m}^{-3}) and

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The density of the interstellar medium in our Galaxy is measured to be \(10^{-21} \mathrm{~kg} \mathrm{~m}^{-3}\) and consists mainly of hydrogen. Estimate how many hydrogen atoms per \(\mathrm{cm}^{3}\) are present in the Galaxy.

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