NGC 2685：螺旋星系
(原标题: NGC 2685: The Helix Galaxy)
2025-07-14
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这个星系发生了什么？NGC 2685是一个被证实的极环星系——一种罕见的星系，由恒星、气体和尘埃组成的环垂直于平坦的星系盘的平面。这种奇怪的结构可能是由于一个盘状星系偶然捕获了另一个星系的物质，被捕获的碎片串成一个旋转的环。尽管如此，观测到的NGC 2685的特性表明，旋转的螺旋结构非常古老和稳定。在这张清晰的图像中，这个奇特的系统也被称为arp336或螺旋星系，当这些奇怪的、垂直的环和其他被扰动的外部结构一起从星系盘前经过时，很容易被追踪到。NGC 2685直径约5万光年，距离大熊座4000万光年。拼凑起来：当天的天文学难题
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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
© Stefan Thrun