Physics 62.1 Understanding Space, Time & Relativity (19 of 55) Redshift of Receding Galaxy

In this video I will calculate the frequency for the observer for the redshift of an RECEDING object (galaxy).

Next video in this series can be seen at:

[charlesbrightman]

The observation of a red shift of receding galaxies could also be explained by our galaxy shrinking as our solar system gets pulled faster and faster towards our galactic center. And isn't that how galaxies form, by gravitational attraction of matter towards a center of gravity? Isn't that why our galaxy is spiral shaped, because the solar systems are being pulled towards the galactic center's black hole while they still have angular momentum? Hence a spiral shape is formed.

[charlesbrightman]

"IF" gravity is matter bending the fabric of space time as is claimed, "then" what occurs to the frequency of light when it gets 'bent' when going through bent space time? And how could that ever be proved?

[charlesbrightman]

What exactly is 'time'? For me, 'time' is the flow of energy. Some I have heard utilize the speed of causality.
But, wouldn't we also see a red shift from the receding galaxies if 'time' were slowing down? Why does it have to be that space is expanding? What exactly is 'space' that it can even expand anyway? And if space can expand and contract, what does that do to the frequency of light? Or maybe even both are true, space expanding and time slowing down, hence we perceive a universe expanding faster and faster? And if that were true, what would that do to the frequency of light? Red shift of far away galaxies even more intense then closer galaxies?