WASHINGTON, May 15 -- Research Notes, a non-peer-reviewed journal that says it features observations in astronomy and astrophysics from the American Astronomical Society, published research articles, including the following topics, in its May 2023 edition:

* Case A or Case B? The Effective Recombination Coefficient in Gas Clouds of Arbitrary Optical Thickness

* Comparison of Distant and Nearby Solar Twins

* Cool Cores in Clusters of Galaxies in the Dark Ene . . .

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