2025年12月31日
HH-222: The Waterfall Nebula
Image Credit & Copyright: Mike Selby
Explanation: 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
Tomorrow’s picture: auroral storming
HH-222: 瀑布星云
影像提供与版权: Mike Selby
说明: 瀑布星云是如何形成的？其起源仍在研究中。这个结构，正式名称为赫比格-哈罗天体222（HH 222），位于猎户座大分子云复合体中的NGC 1999区域。这条延伸的气体流约十光年长，但看起来类似于地球上的长瀑布。最近的观测显示，HH-222可能是一个巨大的气体弓形震波，类似于高速航行的船只激起的水波。然而，人们认为这个震波的起源是位于画面左下方的多重恒星系统猎户座V380所喷出的喷流。因此，气体并非沿着瀑布流动，而是整个结构向右上方移动。瀑布星云位于猎户座方向，距离地球约1,500光年。这幅照片是本月初在智利的柳树（El Sauce）天文台在拍摄的。
拼图星云: 每日天文谜题
明日的图片: auroral storming
