NGC 2685 :螺旋星系
NGC 2685: The Helix Galaxy

來源:Stefan Thrun|發表日期:2025-07-14
這個星系是怎麼回事?NGC 2685 是一個被證實的極環星系--這是一種罕見的星系,恆星、氣體和塵埃在垂直於平坦的星系盤平面的環狀軌道上執行。這種奇異的構造可能是由於一個盤狀星系偶然捕捉了另一個星系的物質,被捕捉的碎片串成了一個旋轉的環。不過,NGC 2685 的觀測特性表明,旋轉螺旋結構非常古老和穩定。在這個被稱為 Arp 336 或螺旋星系的奇特系統的清晰檢視中,我們可以很容易地追蹤到奇特的垂直環,它們從星系盤前穿過,同時還有其他受干擾的外部結構。NGC 2685 直徑約為 5 萬光年,距離 4000 萬光年,位於大熊座(大熊座)。 拼湊起來每日天文拼圖
原文:What is going on with this galaxy? NGC 2685 is a confirmed polar ring galaxy - a rare type of galaxy with stars, gas and dust orbiting in rings perpendicular to the plane of a flat galactic disk. The bizarre configuration could be caused by the chance capture of material from another galaxy by a disk galaxy, with the captured debris strung out in a rotating ring. Still, observed properties of NGC 2685 suggest that the rotating helix structure is remarkably old and stable. In this sharp view of the peculiar system also known as Arp 336 or the Helix galaxy, the strange, perpendicular rings are easy to trace as they pass in front of the galactic disk, along with other disturbed outer structures. NGC 2685 is about 50,000 light-years across and 40 million light-years away in the constellation of the Great Bear (Ursa Major). Piece it All Together: Astronomy Puzzle of the Day
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