Exactly, if there was no explosion, what gave them the velocity to move so fast?
English
-
Spatial expansion. They're not moving away from each other, the space between them is growing at an accelerating rate.
-
If how does nothing expand on its own? Much less move entire systems?
-
It's not pushing anything. The space itself is literally getting larger. Why this occurs is a very great question, and I would love for you to help the effort in figuring out the answer. Nobel prize, millions of dollars, hot chix, the whole package deal comes with the cosmological constant.