Other than our local cluster of galaxies, all galaxies are speeding away from each other. The farther away the galaxy, the faster it is moving away. This seems to be contrary to gravitation effects and seems to be related to the "big bang" of 13 billion (or so) years ago.
It isn't quite clear to me what "initial movements" you refer to; but the general tendency is that anything that moves continues to move at a constant speed - unless some force makes it change its velocity. That's Newton's First Law.
Gravitation.
Gravity
Given by the fact that electromegnetic energy cannot be seen and how the radiation from distant galaxies supports the big bang theory? it can easily be said that...I dont know the answer. (0_0)
This movement has everything to do with the Bing Bang theory. The whole idea is that the Universe started with matter compressed into a very small space, and that from there, it expanded, and continues to expand to the present day.(Edit : Of course the expansion is measured at the level of galaxies. The movement of stars within galaxies is not connected to the expansion.)
The person who discovered the galaxies are rushing away from one another and the universe is expanding from an original big bang was Edwin Hubble.
The Big bang theory states that the galaxies are in fact moving away from each other
Constellations are components of galaxies and have little to do with the Big Bang Theory.
Quite simply, gravitation is not enough to stop the movement. The movement itself is a leftover from the Big Bang.
The Big Bang theory states that the galaxies in the universe were formed almost 14 billion years ago. The Big Bang theory proves the galaxy spread out as it formed.
Gravitation.
Some galaxies would be older than others; the oldest galaxies formed pretty soon after the Big Bang - the oldest known galaxy formed about 750 million years after the Big Bang.
The Big Bang Theory
The Big Bang theory was set up to explain observations - for example, the redshift of distant galaxies, which is usually interpreted to mean that the galaxies move away from us.
Galaxies Move away from the area of the big bang with time at speeds higher than that of light.
Redshift: The only reasonable explanation for the redshift is that most galaxies are moving away from us.As for the cosmic background radiation and the chemical composition, both of these closely match what is expected from the models about the Big Bang.
Many scientists believe that the big bang started life. The big bang was a big explosion and the galaxies began.
The redshift of distant galaxies.