The Average Density of the Interstellar Medium Is

question 7

Multiple Choice

The average density of the interstellar medium is

• A) 1 atom/cm³.
• B) 1,000 atoms/cm³.
• C) 10⁴ atoms/cm³.
• D) 10⁶ atoms/cm³.
• E) 10¹² atoms/cm³.

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