Summary of evidence showing the unique source and double lens nature of J1721+8842. Credit: arXiv (2024). DOI: 10.48550/arxiv.2411.04177 An international team of astronomers has discovered an instance of two galaxies aligned in a way where their gravity acts as a compound lens. The group has written a paper describing the findings and posted it on the arXiv preprint server. Prior research has led to many findings of galaxies, or clusters of them, bending light in ways that were predicted by Eins...