Steve James wrote:Fwiw, I think the explanation is that the light from stars that are moving away from our pov become more red-shifted to the point where the light is invisible to our eyes. So, if we could see in that spectrum (and there were no atmosphere), the sky would always look dark.
The idea that the universe is expanding has been demonstrated. The lingering question is how fast and if it will stop. Right now, they claim that it is speeding up.
Hey Steve, I think you mean: "So, if we could see in that spectrum (and there were no atmosphere), the sky [edit; no sky outside the atmosphere] would always look light"
Steve James wrote:How about this. Why is it that all the stars we see with our eyes appear to be white? Why aren't they all different colors --whether the universe is fixed or expanding?
Giles wrote:...So the red shift we see in stars in the Milky Way will be less, and from the stars in our own backyard - a few hundred or thousand light years all around - even less still.
it would seem that we should be seeing all those "redder" stars, just like we're hearing lower pitch on an ambulance siren when it's moving away...
Steve James wrote:Here's a nice explanation of the relation of redshift to expanding space.
https://www.youtube.com/watch?v=LE_wbOw39Mk
Trick wrote:in space, no one can hear you scream
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