It's not that they have their own momentum, the dark energy force is not the only force in the universe, see gravity also affects in this, and sometimes gravity is stronger than the dark energy, and thats why galaxies collide, but this dark energy is constant so as 2 galaxies collide because of the force of gravity wich pulls them into each other they are still moving away together from other points of the universe. Did I explain myself well?
Ok enough of this bickering it's really ruining my mood, I will not take it how I want but how it is, I think it is the logical thing to do. Thank you for the apology.
Edited by Alex01, 07 September 2007 - 12:39 PM.