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JWST discovers mysterious object with one single emission line in the Hubble Ultra Deep Field within the constellation of Fornax — where there doesn't seem to be anything at all

A Single Line Emitter Identified in an Unbiased Search with JWST/NIRSpec: Multiobject Coronagraphy for Slitless Spectroscopy, Huberty, Mason S., Scarlata, Claudia, Hayes, Matthew J., Henry, Alaina, Berg, Danielle A., Cammelli, Vieri, Ellis, Richard, Jaskot, Anne E., Lin, Yu-Heng, Mehta, Vihang, Mingozzi, Matilde, Monaco, Pierluigi, Saldana-Lopez, Alberto, Saxena, Aayush, Tan, Jonathan C., Young, Alice

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