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RE: The Sirens Song - Doppler Effect - Redshift and Blueshift.
I've never been able to wrap my brain around the concept of what the universe is expanding into. It's quite beyond my capacity to think logically about that.
Well there is a possibility there are multiple universes all moving away from each other at the speed of light or beyond, thus providing a never ending expanse of 'space' for us to expand into. if that helps you conceptualize it a bit better.
God, it all just got even worse in my brain :D Need to look at the flowers in my garden to calm my brain down a bit.