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Discussion based on the Astronomy Picture of the Day fro November 2
https://apod.nasa.gov/apod/ap211102.html
Related Nature article: https://www.nature.com/articles/s41550-021-01446-5
And a related article on the arXiv: https://arxiv.org/abs/2106.08935
Paper on time delay lens modeling challenge: https://arxiv.org/abs/1801.01506