AFGL 2591, also known as IRAS 20126+4104, is an astronomical object located in the constellation Cassiopeia. It is a proto-planetary nebula, which is a phase in the evolution of a star similar to our Sun that is transitioning away from the asymptotic giant branch phase. This nebula is notable for exhibiting features typical of these types of objects, including a central star that is surrounded by expanding gas and dust.
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