The NIRSpec (Near-Infrared Spectrograph) is one of the four scientific instruments flown on the James Webb Space Telescope (JWST).

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NASA’s James Webb Finds Water, and a New Mystery, in Rare Main Belt Comet | Using Webb’s NIRSpec (Near-Infrared Spectrograph) instrument, astronomers have confirmed gas – specifically water vapor – around a comet in the main asteroid belt for the first time.

NASA’s Webb Telescope NIRSpec Instrument Ready for Science

NIRSpec has spun its wheels successfully - NASA Webb blog