Quote:
Originally Posted by kennyc
.isn't the Universe everything?
|
It's everything that exists in our four-dimensional spacetime, which is all that we can perceive. However, many modern theories postulate high-dimensional spaces within which our universe is merely one of many, and each of which could have very different physical laws. Eg, a minor change in Planck's constant, or the gravitational constant, or the charge on the electron would make life as it exists in our universe impossible. But that, of course, is merely a restatement of the "anthropic principle" which answers the question "why is our universe the way it is" with the answer "because if it were different we wouldn't be here to observe it".