# Our galaxy, the Milky Way, forms part of a galaxy group called The Local Group. What are the parameters that dictate what a galaxy group is?

Are there different classifications or just the one? How does our galaxy group compare with others?

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There is only one local group - the Local Group. This is the name of the galaxy group that the Milky Way resides in. Perhaps you are asking for a definition of a galaxy group? –  Moriarty Dec 31 '13 at 6:40
@Moriarty Yes, that's what I'm asking about. I edited my question to reflect this. –  Eduardo Serra Dec 31 '13 at 13:07
I'm not prepared to post an answer to this just yet, but basically, individual galaxies and galaxy clusters are well defined structures in the universe. Galaxy groups are loose associations of individual galaxies, but which do not contain the amount of total mass which clusters have ($\gtrsim 1\times 10 ^{13} M_{\odot}$). They are therefore not strictly defined in terms of numbers of galaxies, but do have their place in the mass hierarchy. –  astromax Dec 31 '13 at 15:45