Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
303 | AMA | February 2025
Sean Carroll
You're measuring the redshift and some of that, not most of it, just a small amount, but some of it is from the Doppler effect. And that Doppler effect that affects the redshift and therefore your inferred distance only is added to the distance measure radially, that is to say in the direction of your line of sight.
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