I know (cos I read it) now that every galaxy is moving away from every other galaxy.
However, I can't visualize this.
Suppose these galaxies A, B, and C are in line with each other like this
A .............B................................C
So, if A is moving at velocity X towards B, and B is also moving at velocity Y towards C
, then we can see B moving away from us ( A) at (y-x).
Also, if C is moving away from A at velocity Z, then we can see C moving away from us at (z-x)??
So, the velocities are not equal??? So, how do they say everything is moving away from each other at same speed?
For example, if you bake a load of bread with raisins inside, after baking the
load is bigger and the raisins inside have moved apart from each other?
But, is this a good example??
How do we say the universe started with big bang when we can't find a center and
every thing is moving away from everything else at the same speed?