If a cubic centimeter of air on Earth contains about $10^{19}$ molecules, what is the approximate particle density range in the densest interstellar clouds?
Answer
$10^3$ to $10^6$ particles per cubic centimeter.
Despite appearing dense in the cosmic context, even the densest parts of an interstellar cloud contain a minuscule amount of matter, typically ranging from $10^3$ to $10^6$ particles per cubic centimeter.
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