User talk:Aseyhe
Hello, Aseyhe, and welcome to Wikipedia! Thank you for your contributions. I hope you like this place and decide to stay.
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Very astute word choice in changing "expansion-induced motion" to "expansion-associated motion"! That's a completely safe way of expressing it. And yet...I'm tempted to change it back. Though I didn't labor over that phrase when I added it, this point nags at me: Denying that this motion is expansion-induced seems to imply that it must be intrinsic to the objects that are receding from each other. How then could it be a "valid choice of coordinates" (as stated in the article lead) to describe the Hubble flow as an expansion of space? — HelpMyUnbelief (talk) 04:50, 5 June 2024 (UTC)
- Hi! The key thing to realize is that *expansion of space* is not a physical phenomenon. That's what it means to be a coordinate choice. Suggesting that expansion of space causes things to move apart is like suggesting that if you run north from the south pole, the diverging meridian lines cause your body to be pulled apart.
- Physically, cosmic expansion just means that the contents of the universe are moving apart. For convenience, we may choose to describe the positions of those contents with an expanding coordinate system -- but that's a choice we (and not the universe) make. Aseyhe (talk) 01:56, 6 June 2024 (UTC)