Science & ResearchAug 10, 2026
Ubiquitous Interstellar Neutral Helium Detected with JWST
We report the discovery of ubiquitous neutral helium emission in sky spectra taken with JWST's NIRSpec instrument.
We report the discovery of ubiquitous neutral helium emission in sky spectra taken with JWST's NIRSpec instrument. The emission, with a wavelength of 1.0833 micron, resembles one of the "sky lines" that are seen by ground-based observatories. We examine this emission in all…
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