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In order to [[clarify]] terminology, [http://en.wikipedia.org/wiki/George_Ellis George Ellis], U. Kirchner and W.R. Stoeger recommend using the term ''the Universe'' for the theoretical model of all of the connected [[space-time]] in which we live, ''universe domain'' for the observable universe or a similar part of the same space-time, ''universe'' for a general space-time (either our own ''Universe'' or another one disconnected from our own), ''[[multiverse]]'' for a set of disconnected space-times, and ''multi-domain universe'' to refer to a model of the whole of a single connected space-time in the sense of [http://en.wikipedia.org/wiki/Chaotic_inflation chaotic inflation] models.
In order to [[clarify]] terminology, [http://en.wikipedia.org/wiki/George_Ellis George Ellis], U. Kirchner and W.R. Stoeger recommend using the term ''the Universe'' for the theoretical model of all of the connected [[space-time]] in which we live, ''universe domain'' for the observable universe or a similar part of the same space-time, ''universe'' for a general space-time (either our own ''Universe'' or another one disconnected from our own), ''[[multiverse]]'' for a set of disconnected space-times, and ''multi-domain universe'' to refer to a model of the whole of a single connected space-time in the sense of [http://en.wikipedia.org/wiki/Chaotic_inflation chaotic inflation] models.
==External links==
==External links==
* [http://www.pbs.org/wnet/hawking/html/home.html ''Stephen Hawking's Universe''] - why is the universe the way it is?
* [http://www.pbs.org/wnet/hawking/html/home.html ''Stephen Hawking's Universe''] - why is the universe the way it is?
