For some mind-expanding examples of the (probable) insufficiency of our concept of "universe," see: http://en.wikipedia.org/wiki/Multiverse#Tegmark.27s_classif

For some mind-expanding examples of the (probable) insufficiency of our concept of "universe," see: http://en.wikipedia.org/wiki/Multiverse#Tegmark.27s_classification http://en.wikipedia.org/wiki/Multiverse#Tegmark.27s_classifi... At various levels, it's possible that our own Hubble volume ("universe") is only a small stable bubble in a much larger physical system.