银河图景-在曼哈顿地平线上遥望猎户座[配音版]

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曼哈顿地平线

这张摄于2月13日的城市夜景图很引人注目，图中曼哈顿上东区灯光闪耀。这张由一系列数码曝光组成的黑白图像让人想起了那个年代，在当时敏感的黑白胶片还是昏暗夜景和天体摄影术的热门选择。该图历时2分40秒，合共22帧，画面横跨纽约市中央公园的水库，恒星在延时视图中留下轨迹，而飘荡的流云在天空中绘出图案。在这张超现实图片中，自上方向下延伸的虚线，则是来自于仍沐浴于阳光中并移向东南地平线的国际空间站。两次曝光之间的短时间间隔使得图片中这些明亮的轨迹之间留下了空隙。

翻译：银河说翻译组 Lee

审核：银河说顾问组一米

Manhattan Skylines

Image Credit & Copyright: Stan Honda

Explanation: City lights shine along the upper east side of Manahattan in this dramatic urban night skyscape from February 13. Composed from a series of digital exposures, the monochrome image is reminiscent of the time when sensitive black and white film was a popular choice for dimly lit night and astro-photography. Spanning 2 minutes and 40 seconds, the combined 22 frames look across the reservoir in New York City’s Central Park. Stars trail in the time-lapse view while drifting clouds make patterns in the sky. Traced from top to bottom, the dashed line in the surreal scene is the International Space Station still in sunlight and heading for the southeast horizon. The short time intervals between the exposures leave gaps in the space station’s bright trail.

猎户座LL星与猎户座星云

恒星让猎户座大星云中的气体与尘埃之海波涛涌动。这幅美丽宇宙云气和恒星风的特写影像中，呈现了猎户座LL星和猎户座星云物质流的互动。漂流在猎户座星云恒星育星室内、尚处在形成阶段的猎户座LL星，产生了比我们处于中年期的太阳更为强烈的恒星风。随着高速恒星风冲撞缓慢流动的云气，就形成了激波前缘，这就类似于船在水中穿行留下的舷波和飞机超音速划过天空产生的激波。影像中心左上方优雅的小型弧状结构是猎户座LL星产生的弓状激波，其尺寸大约有半光年。较慢速的云气，则是自猎户座星云中心的炽热四合星群向外泛流的物质。在三维空间里，猎户座LL星弯曲的激波前缘，形似一个碗，因我们沿底边方向观测时显得最为明亮。在一幅巨大的呈现猎户座星云因恒星诞星活动、物质泛流成各种复杂结构的拼嵌影像中，这幅美丽的影像只是其中的一部分。

翻译：银河说翻译组 我爱喝橙汁橙汁

审核：银河说顾问组 谢凯泉

LL Ori and the Orion Nebula

Image Credit: NASA, ESA, and The Hubble Heritage Team

Explanation: Stars can make waves in the Orion Nebula’s sea of gas and dust. This esthetic close-up of cosmic clouds and stellar winds features LL Orionis, interacting with the Orion Nebula flow. Adrift in Orion’s stellar nursery and still in its formative years, variable star LL Orionis produces a wind more energetic than the wind from our own middle-aged Sun. As the fast stellar wind runs into slow moving gas a shock front is formed, analogous to the bow wave of a boat moving through water or a plane traveling at supersonic speed. The small, arcing, graceful structure just above and left of center is LL Ori’s cosmic bow shock, measuring about half a light-year across. The slower gas is flowing away from the Orion Nebula’s hot central star cluster, the Trapezium, located off the upper left corner of the picture. In three dimensions, LL Ori’s wrap-around shock front is shaped like a bowl that appears brightest when viewed along the “bottom” edge. This beautiful painting-like photograph is part of a large mosaic view of the complex stellar nursery in Orion, filled with a myriad of fluid shapes associated with star formation.

宇宙浩渺。