Why Does Cosmic Expansion Cause Redshift?

Frequently, people don't understand why expansion means that light gets redshifted. Here I link the two ideas. What causes the redshift of light, and how do represent it mathematically? What exactly gets stretched? Where does the energy go when it gets redshifted? It is critical to understand these principles because without this understanding the entire baseline of cosmology is hard to get. Everything is a measurable, and redshift is one of those things. For from a mystery or a trick of the math, it’s a real occurrence. As part of this, we study the expansion in great detail, outlining the Robertson-Walker Metric, a solution to the Einstein Field Equations of General Relativity. This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter.
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Redshift: en.wikipedia.org/wiki/Redshift
Hubble's Law: en.wikipedia.org/wiki/Hubble%...
Cosmic Scale Factor: en.wikipedia.org/wiki/Scale_f...)
FLRW Metric: en.wikipedia.org/wiki/Friedma...

[@jmfp21jp]

These are the questions that I'm always asking fantastic!!

[@zeropol]

That is a lot of very interesting lectures posted in a short interval of time. I hope we are nearer from the start than the end.

[@JasonKendallAstronomer]

Oh, I have a LOT more material.... I'll be doing a full cosmology course, and maybe.... a full astrophysics course....

[@zeropol]

Im delighted to learn this.

[@DrDeuteron]

2:45 props for showing dispersionless propagation...most yt animations don't.

[@phukfone8428]

2:37 that is a shockable rhythm

[@martinnyberg71]

Is there a way of discerning effects of cosmological redshift from the redshift due to relative motion of emitter and receiver? 🤔

[@shashilwow]

Keep up the good work!

[@JasonKendallAstronomer]

Thanks, will do!

[@gabrielnetto4565]

is the universe happening inside a black hole? the redshift we observe for distant objects is kind of the same we would theoretically observe in objects crossing an event horizon. For us as observers, would you say our perception of time itself, and the fact the universe looks infinite, could be caused by the stretching of one of four dimentions spacetime if our universe was happening inside a blackhole? Love your videos!