*NASA's WMAP team offers an "Explanation of the universal expansion" at a very elementary level*Expanding raisin bread from the University of Winnipeg: an illustration, but no explanation*"Ant on a balloon" analogy to explain the expanding universe at "Ask an Astronomer".
* NASA's WMAP team offers an "Explanation of the universal expansion" at a very elementary level* Hubble Tutorial from the University of Wisconsin Physics Department* Expanding raisin bread from the University of Winnipeg: an illustration, but no explanation* "Ant on a balloon" analogy to explain the expanding universe at "Ask an Astronomer".