APOD的说明

红外线的银河中心（成大）

说明: 我们的银河究竟在上演甚么样的故事？哈伯与史匹哲太空望远镜连手拍摄银河中心，红外线提供了银河中心过去未曾了解的细节特征。分析银河中心来说，红外线是相当不错的工具，可见光会受到尘埃遮蔽。这张影像为哈伯太空望远镜的NICMOS去年所拍摄的2000张影像所结合，幅宽300光年，其中的115光年是用高分辨率(分辨率约为20倍太阳系)的资料，可解析出云气、暗色尘埃、以及大型星团。磁场使电浆沿着左上方的圆拱星团(Arches Cluster)，右下方五胞胎星团(Quintuplet Cluster)附近的旺盛星际风产生柱状特征，且在影像右下方可发现人马座A*围绕着大质量的星团中心，至今仍不清楚为什么大质量星团的中央会发现独立的恒星。

红外线下的银河系中心（北馆）

影像提供：Hubble: NASA, ESA, & D. Q. Wang (U. Mass, Amherst); Spitzer: NASA, JPL, & S. Stolovy (SSC/Caltech)

说明：在我们银河系中央发生了什么？ 为了找出答案，哈勃和斯皮策太空望远镜共同努力，在红外光线下探索到该区域空前的细节。红外光线特别有助于探测银河系中央，因为可见光很容易被尘埃遮蔽。上面的影像集合了超过2,000多张哈勃太空望远镜的NICMOS在去年拍摄的影像。这张如此高分辨率的影像涵盖了300*115光年，其中可辨别大小为我们太阳系20倍的区域。在这里可以同时看到炽热的氢气和黑暗尘埃云以及三个巨大的恒星团。磁场会引导电浆沿着左上方圆拱星团附近流动，而高能的恒星风在左下方的五合星团附近侵蚀出了气体柱。在右下方可以看到大质量中央恒星团围绕着人马座A*。为什么一些明亮的大质量中央恒星看上去与这些恒星团没有联系，原因还未知。

The Galactic Core in Infrared
Explanation: What's happening at the center of our Milky Way Galaxy? To help find out, the orbiting Hubble and Spitzer space telescopes have combined their efforts to survey the region in unprecedented detail in infrared light. Infrared light is particularly useful for probing the Milky Way's center because visible light is more greatly obscured by dust. The above image encompasses over 2,000 images from the Hubble Space Telescope's NICMOS taken last year. The image spans 300 by 115 light years with such high resolution that structures only 20 times the size of our own Solar System are discernable. Clouds of glowing gas and dark dust as well as three large star clusters are visible. Magnetic fields may be channeling plasma along the upper left near the Arches Cluster, while energetic stellar winds are carving pillars near the Quintuplet Cluster on the lower left. The massive Central Cluster of stars surrounding Sagittarius A* is visible on the lower right. Why several central, bright, massive stars appear to be unassociated with these star clusters is not yet understood.

The NICMOS mosaic image represents the largest piece of sky ever mapped for one NICMOS observing program. It was combined with a full-color Spitzer image to yield a color composite of the nuclear region. The picture measures 300 x 115 light-years. Outside the boundary of the NICMOS survey, the IRAC exposures (which are 1/10th as sharp) can be seen at wavelengths of 3.6 microns (shown as blue), 4.5 microns (shown as green), 5.8 microns (shown as orange), and 8.0 microns (shown as red).

无图贴是什么意思？？

好象某个翻译实在是太烂了。。。不过最好加上图，无图贴貌似违规了。