Barred Spiral Milky Way——NASA酷图！
http://antwrp.gsfc.nasa.gov/apod/image/0508/MWart_spitzer_f50.jpg说明： A recent survey of stars conducted with the Spitzer Space Telescope is convincing astronomers that our Milky Way Galaxy is not just your ordinary spiral galaxy anymore. Looking out from within the Galaxy's disk, the true structure of the Milky Way is difficult to discern. However, the penetrating infrared census of about 30 million stars indicates that the Galaxy is distinguished by a very large central bar some 27,000 light-years long. In fact, from a vantage point that viewed our galaxy face-on, astronomers in distant galaxies would likely see a striking barred spiral galaxy suggested in this artist's illustration. While previous investigations have identified a small central barred structure, the new results indicate that the Milky Way's large bar would make about a 45 degree angle with a line joining the Sun and the Galaxy's center. DON'T PANIC ... astronomers still place the Sun beyond the central bar region, about a third of the way in from the Milky Way's outer edge.
原文来自：http://antwrp.gsfc.nasa.gov/apod/ap050825.html 太漂亮了``` 看呆了。。 好漂亮的Milk Way，中间黑乎乎的东西是怎么去掉的呢？ 翻译一下意思，给不懂中文的同学
图中的黄点为太阳
美国宇航局的斯皮策红外望远镜通过多年观测，发现横亘夜空的银河系并非像天文学家之前猜测那样呈现规则的涡旋状，而是有一条长达27000光年的恒星棒架在螺旋星云臂中间。
这条“横梁”共27000光年长，相当于太阳到银河系中心的距离的一半。“横梁”光亮耀眼，由银河系中心附近大约3000万颗上了年纪的红色星球汇聚而成。而且，这条恒星“横梁”角度很特殊，在银河漩涡的平面上，可以看到其正好与太阳到银河系中心的直线形成45度角。
对于银河系中心为何会存在这样一条“横梁”，科学家目前还无法得知，只知道从其它类似结构的星系看来，有了这条“横梁”，星系会更加稳定。
:shock: :shock:
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