[LibWhacker]

There is no way gravity does ANYTHING worth talking about at those distances. Gravity is the weakest force in nature and does not control the cosmos, period.

Galactic clusters are held together by gravity and until quite recently cosmologists were unsure whether or not gravity might actually halt the expansion of the universe and lead to a Big Crunch. Gravity plays a huge role in shaping the universe.

[wendy1946]

Galactic clusters are held together by gravity

Not really. Websites which provide real info on this topic include:

http://www.thunderbolts.info
http://www.electric-cosmos.org
http://www.plasmacosmology.net
http://www.rense.com/general72/eelec.htm
http://www.holoscience.com

and a number of others, but that should do for starters.

Like I said, gravity cannot control anything on that sort of scale.