HH-222：瀑布星云
(原标题: HH-222: The Waterfall Nebula)
2025-12-31
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是什么创造了瀑布星云？其起源仍在研究中。这个结构，官方命名为赫比格-哈罗222，出现在NGC 1999区域的猎户座大分子云复合体中。细长的气体流绵延约10光年，但看起来与地球上的长瀑布相似。最近的观测表明，HH-222很可能是一个巨大的气体艏激波，类似于一艘快速移动的船只引起的水波。这个冲击波的起源被认为是来自画面左下方的猎户座V380多星系统的喷流。因此，气体不会沿着瀑布流动，而是整个结构向右上方移动。瀑布星云位于大约1500光年外的猎户座。这张特色图片是本月早些时候从智利的El Sauce天文台拍摄的。拼图星云：今日天文谜题
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What created the Waterfall Nebula? The origin is still being researched. The structure, officially designated Herbig-Haro 222, appears in the region of NGC 1999 in the Great Orion Molecular Cloud complex. The elongated gaseous stream stretches about ten light years but appears similar to a long waterfall on Earth. Recent observations indicate that HH-222 is likely a gigantic gaseous bow shock, similar to a wave of water caused by a fast-moving ship. The origin of this shock wave is thought to be a jet outflow from the multiple star system V380 Orionis off the lower left of the frame. Therefore, gas does not flow along the waterfall, but rather the entire structure moves toward the upper right. The Waterfall Nebula lies about 1,500 light years away toward the constellation of Orion. The featured image was captured earlier this month from El Sauce Observatory in Chile. Jigsaw Nebula: Astronomy Puzzle of the Day
© Mike Selby