Diffuse 1.0833 micron neutral helium emission is detected in most JWST NIRSpec fixed-slit spectra and attributed to the interstellar helium focusing cone, with new hour-scale variability.
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Ubiquitous Interstellar Neutral Helium Detected with JWST
Diffuse 1.0833 micron neutral helium emission is detected in most JWST NIRSpec fixed-slit spectra and attributed to the interstellar helium focusing cone, with new hour-scale variability.