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A protoplanetary nebula or pre planetary nebula is an astronomical object which is at the short-lived episode during a star's rapid evolution between the late asymptotic giant branch phase and the subsequent planetary nebula phase. A PPN emits strongly in infrared radiation, and is a kind of reflection nebula.
A protoplanetary nebula or pre planetary nebula is an astronomical object which is at the short-lived episode during a star's rapid evolution between the late asymptotic giant branch phase and the subsequent planetary nebula phase. A PPN emits strongly in infrared radiation, and is a kind of reflection nebula.
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