What does it mean for a galaxy to be referred to as "dead"?
Answer
It has effectively quenched, running out of cold gas and dust.
A galaxy is labeled "dead" when it has quenched, meaning the necessary cold gas and dust required to ignite new stellar nurseries have been depleted.
#Videos
NASA finds dead spiral galaxy - YouTube
JWST Finds a Bizarre Galaxy In Early Universe That Appears Dead
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