WASHINGTON, July 9 -- The Astronomical Journal, a journal from the American Astronomical Society that says it publishes astronomical research, with an emphasis on scientific results derived from observations, published research articles, including the following topics, in its August 2021 edition:

* Disequilibrium Chemistry in Exoplanet Atmospheres Observed with the Hubble Space Telescope

* Elemental Abundances in M31: Gradients in the Giant Stellar Stream

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