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/sci/ - Science & Math

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>> No.14951798 [View]
File: 49 KB, 909x850, angular diameter turnaround.png [View same] [iqdb] [saucenao] [google]
14951798

>>14947426
If I'm understanding what your third sentence is arguing, the truth is that the footprint of light DOES appear close to us - it's called the Angular Diameter Turnaround
Apologies if I've misunderstood

>> No.14544391 [View]
File: 49 KB, 909x850, byFEx.png [View same] [iqdb] [saucenao] [google]
14544391

>>14544376
The size it appears to be is not based on its current distance from us, but the distance it was to our position when the light was emitted.

>> No.6532371 [DELETED]  [View]
File: 49 KB, 909x850, CosmoDistanceMeasures_z_to_1e4.png [View same] [iqdb] [saucenao] [google]
6532371

Any cosmologists here?
I'd like to know why angular diameter distance decreases as a function of redshift at high values of z

>> No.6522481 [View]
File: 49 KB, 909x850, CosmoDistanceMeasures_z_to_1e4.png [View same] [iqdb] [saucenao] [google]
6522481

http://en.wikipedia.org/wiki/Angular_diameter_distance

>In other words an object "behind" another of the same size, beyond a certain redshift (roughly z=1.5), appears larger on the sky, and would therefore have a smaller "angular diameter distance".

Can someone explain in layman's terms why the angular distance decreases after a certain distance?

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