The James Webb Telescope’s new image of Cassiopeia A (Cas A), a supernova remnant that is located 1,000 light-years away, has marked a new era in the study of its explosion. Already in April 2023, Webb’s MIRI (Mid-Infrared Instrument) revealed new and surprising features within the inner shell of Cas A. Interestingly, many of those features are invisible in the latest image by the telescope’s NIRCam (Near-Infrared Camera), while the NIRCam image appears also less colourful than the one provided by MIRI. But according to researchers, this is simply the result of different wavelengths — and instead of showing less…

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