Compared to the IGM, by approximately what factor is the density of matter within the Milky Way Galactic Disk greater?

Answer

A factor of a million or more

The density difference between the Milky Way disk (approx. $10^6$ particles/$m^3$) and the IGM ($< 1$ particle/$m^3$) is stated to be roughly a factor of a million or more.

Compared to the IGM, by approximately what factor is the density of matter within the Milky Way Galactic Disk greater?

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