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earth from space
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Earth From Space

Interstellar space is the physical space within a galaxy not occupied by stars or their planetary systems. The interstellar medium resides—by definition—in interstellar space.
Intergalactic
Intergalactic space is the physical space between galaxies. Generally free of dust and debris, intergalactic space is very close to a total vacuum. The space between galaxy clusters, called the voids, is probably nearly empty. Some theories put the average density of the Universe as the equivalent of one hydrogen atom per cubic meter. 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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Filename:412581.jpg
Album name:Earth & Universe
Rating (1 votes):55555
Keywords:#earth #space
Filesize:36 KiB
Date added:Sep 09, 2011
Dimensions:700 x 465 pixels
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