Intergalactic space is the physical space between
galaxies. Generally free of dust and debris, intergalactic space is very close to a total
vacuum. The average density of the
Universe is less than one
atom per cubic meter. Average temperature is only 3
Kelvin. The density of the Universe, however, is clearly not uniform; it ranges from relatively high density in galaxies (including very high density in structures within galaxies, such as
planets,
stars, and
black holes) to conditions in vast voids that have much lower density than the Universe's average.
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The diffuse matter found in the space between galaxies. In some
clusters of galaxies, the space between galaxies has been observed to contain very hot, diffuse gas.
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