Astronomers observed Supernova 2004et and Supernova 2017eaw using Webb’s MIRI instrument (Mid-Infrared Instrument).
's imaging wavelengths allow it to peer into stellar dust clouds, revealing intimate cosmic phenomena such as star formation.
Over 5,000 Earth masses of dust were estimated to be in SN 2004et. As a result, it has the "highest dust mass" ever detected in a supernova. “When you look at the calculation of how much dust we’re seeing in SN 2004et especially, it rivals the measurements in SN 1987A [supernova], and it’s only a fraction of the age. It’s the highest dust mass detected in supernovae since SN 1987A,” said Ori Fox of the Space Telescope Science Institute.
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