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For those interested in the cosmic distance ladder, David Butler has an excellent youtube series "How far away is it?", detailing the methods used to estimate distance along the cosmic distance ladder, the history, and examples. I highly recommend.

https://www.youtube.com/playlist?list=PLpH1IDQEoE8QWWTnWG5cK...




Thank you. This series of videos is extremely helpful for understanding the concepts referred to in the article.




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