NGC 7027 :枕頭行星狀星雲
NGC 7027: The Pillow Planetary Nebula

發表日期:2025-08-31
是什麼造就了這個不尋常的行星狀星雲?NGC 7027 被稱為枕頭星雲和飛毯星雲,是目前已知的最小、最亮、形狀最奇特的行星狀星雲之一。從它的膨脹速度來看,NGC 7027 第一次開始膨脹(從地球上可以看到)是在大約 600 年前。 在其歷史的大部分時間裡,這個行星狀星雲一直在排出外殼,正如哈勃太空望遠鏡拍攝的特寫圖片中藍色部分所顯示的那樣。 但到了近代,由於不明原因,它開始向特定的方向噴射氣體和塵埃(如棕色所示),形成了一個似乎有四個角的新圖案。星雲的中心是什麼尚不清楚,有一種假設認為它是一個近雙星系統,其中一顆恆星將氣體噴射到圍繞另一顆恆星執行的不規則圓盤上。NGC 7027 距今約 3000 光年,於 1878 年首次被發現,用標準的後院望遠鏡可以看到天鵝座的方向。
原文:What created this unusual planetary nebula? Dubbed the Pillow Nebula and the Flying Carpet Nebula, NGC 7027 is one of the smallest, brightest, and most unusually shaped planetary nebulas known. Given its expansion rate, NGC 7027 first started expanding, as visible from Earth, about 600 years ago. For much of its history, the planetary nebula has been expelling shells, as seen in blue in the featured image by the Hubble Space Telescope. In modern times, though, for reasons unknown, it began ejecting gas and dust (seen in brown) in specific directions that created a new pattern that seems to have four corners. What lies at the nebula's center is unknown, with one hypothesis holding it to be a close binary star system where one star sheds gas onto an erratic disk orbiting the other star. NGC 7027, about 3,000 light years away, was first discovered in 1878 and can be seen with a standard backyard telescope toward the constellation of the Swan (Cygnus).
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