The James Webb Space Telescope has just spotted a doomed star 40 million light-years away — wrapped in a dust shroud so thick it was invisible to Hubble — and the discovery may finally explain why the

Key Points:

• An international team led by Northwestern University astronomers used the James Webb Space Telescope (JWST) to identify the progenitor star of supernova SN 2025pht, a red supergiant hidden behind a thick carbon-rich dust shroud that made it nearly invisible to the Hubble Space Telescope.
• The discovery resolves a decades-old puzzle in stellar astrophysics where predicted red supergiant progenitors of core-collapse supernovae were missing from observations, showing that these stars were obscured by dust detectable only at JWST’s mid-infrared wavelengths.
• The dust surrounding the progenitor was unexpectedly carbon-rich, suggesting previously unaccounted-for late-stage internal mixing processes in massive red supergiants that dredge up carbon to the outer layers before explosion.
• This finding implies that many red supergiants in the universe may be similarly dust-shrouded, indicating that the missing-red-supergiant problem was largely a measurement limitation of earlier telescopes rather than a fundamental theoretical issue.
• The SN 2025pht detection marks the first time JWST has identified a supernova progenitor star at wavelengths up to 8.7 micrometers, opening a new window for studying the final stages of massive star evolution and supernova progenitor populations.