http://www.rsyke.org/arsykkeet/2002_04/estetiikan_opiskelijana.html
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MyCn18: an hourglass nebula. The sands of time are running out for the central star of this hourglass-shaped planetary nebula. With its nuclear fuel exhausted, this closing phase of a Sun-like star's life occurs as its outer layers are ejected - its core becoming a cooling, fading white dwarf
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