Copyright:
Kfir Simon
原文:
Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a Full Moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured in the expansive image is dominated by the glow of ionized oxygen atoms mapped to a blue hue.
中文翻譯:
被一顆熱、巨大的星星發出的強風吹拂，這個宇宙氣泡非常巨大。被編目為 Sharpless 2-308，它位於距離地球約5200光年的地方，朝向大犬座 (Canis Major)，並且覆蓋的天空面積略大於滿月。這相當於在其估算距離下的直徑為60光年。創造這個氣泡的那顆巨星是一顆沃夫-雷葉特星 (Wolf-Rayet star)，位於星雲的中央附近，閃耀著明亮的光芒。沃夫-雷葉特星的質量超過20倍於太陽，且被認為處於巨星演化的短暫前超新星階段。來自這顆沃夫-雷葉特星的強風，通過捲起先前演化階段的較慢運動物質，形成了這個泡狀星雲。這個風灌星雲的年齡約為70,000年。圖像中捕捉到的相對微弱的發光現象，主要是被映射成藍色的離子化氧原子的光輝。
#宇宙 #星雲 #沃夫雷葉特星 #Sharpless2_308 #大犬座 #天文學 #星際氣泡 #太空探索 #科學 #神秘宇宙 #美麗星空
來源:NASA每日圖片
