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Here’s what readers are saying in Sunday’s letters to the editor.

Here’s what readers are saying in Friday’s letters to the editor.

Center for Astrophysics An infrared view of NGC6334, the Cat’s Paw Nebula, a giant, star-forming molecular cloud. New submillimeter observations of the southern dark complex in this cloud have uncovered the first prestellar cores (embryos of future stars) ever found in a massive cloud, but they are very cold and cannot be seen in infrared images like this one. ESO/J. Emerson/VISTA Stars form as gravity contracts the gas and dust in an interstellar cloud until cores develop that are dense enough to coalesce into stars. A dense core in the earliest phase of this process is called a starless c...