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2622. Angular Diameter Turnaround 

title text: Thank you to Katie Mack for teaching me about this effect, and to Janelle Shane for describing redshifts as 'like galaxies sinking into a pool of dilute blood,' which is how I'll see them from now on.

(xkcd.com/2622)
(explainxkcd.com/wiki/index.php
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· · xkcdbot · 0 · 18 · 14
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