美杜莎星雲
The Medusa Nebula
來源:Bruno Rota Sargi|發表日期:2024-11-22
熾熱氣體編織成的蛇形細絲讓這個星雲有了一個響亮的名字--"美杜莎星雲"。這個美杜莎星雲也被稱為 Abell 21 ,是一個古老的行星狀星雲,位於大約 1500 光年外的雙子座。和它的神話名字一樣,這個星雲也與戲劇性的轉變有關。行星雲階段代表了像太陽這樣的低質量恆星進化的最後階段,它們從紅巨星轉變為炙熱的白矮星,並在這一過程中脫掉外層。來自高溫恆星的紫外線輻射為星雲發光提供了動力。在整個明亮的新月形中,靠近中心的那顆微弱的恆星就是美杜莎的轉化恆星。在這個深度望遠鏡檢視中,更暗的細絲清晰地延伸到下方和左側。據估計,美杜莎星雲的直徑超過 4 光年。
原文:Braided and serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation. The planetary nebula phase represents a final stage in the evolution of low mass stars like the sun as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers. Ultraviolet radiation from the hot star powers the nebular glow. The Medusa's transforming star is the faint one near the center of the overall bright crescent shape. In this deep telescopic view, fainter filaments clearly extend below and to the left. The Medusa Nebula is estimated to be over 4 light-years across.
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