anti-gravity and the universe's expansion

Perhaps there is excess dark matter surrounding the universe and it is continuously pulling on it, causing the universe to expand. …I should discuss this with my one classmate in astronomical sciences, lol

… how would gravity cause this? its affects are becoming less influential on the galaxies as things are farther apart from eachother.

the universe isnt only expanding, its accelerating, so its not momentum, it needs a constant applied force.

astronomers have even observed distant stars and objects actually REPEL from eachother (hence the anti-gravity proposal)

hay just an idea but if there are gravitons, could there me anti-gravitons? that cause the opp affect?

The Universy is expanding due to momentum, there is no debate over this fact. however it is not 100% certain that gravity will eventual over come this, and cause the Universe to collapase on itself.

already read most of the elegant universe and seent eh documentary. but dark matter has gravity, and is extreemly dense

I’ve also heard the same thing about dark matter, but if you want to dive further into the theorem of space-time, matter, etc. you could also check out string-theory. There’s loads of conjecture about this, but anti gravity could be one factor.