There are probably more than 170 billion

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There are probably more than 170 billion

Post by Guest on Sun Nov 28, 2010 3:01 am

There are probably more than 170 billion (1.7 × 1011) galaxies in the observable universe.[7][8] Most galaxies are 1,000 to 100,000[9] parsecs in diameter and are usually separated by distances on the order of millions of parsecs (or megaparsecs).[10] Intergalactic space (the space between galaxies) is filled with a tenuous gas of an average density less than one atom per cubic meter. The majority of galaxies are organized into a hierarchy of associations called clusters, which, in turn, can form larger groups called superclusters. These larger structures are generally arranged into sheets and filaments, which surround immense voids in the universe.[11]

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