How many atoms are in the average cubic square of interstellar space?
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average, the density of matter in the space between the 1011 stars of the Milky Way is 0.1 neutral hydrogen atoms (H) per cubic centimeter." Mammana, Deniss L. Interstellar Space. New York: Popular Science, 2000: 220. "On the average, this haze contains about one atom per cubic centimeter."
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