APOD:2015.9.21

Sweet丿Kim (金) 天王星
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发表于:2015-09-24 12:52 [只看楼主] [划词开启]

哈伯望远镜拍摄的螺旋星系M96 

影像提供: 

ESA/Hubble & NASA and the LEGUS Team; Acknowledgement: R. Gendler

说明: 

在这张美丽宇宙岛的彩色细致影像里,尘埃带看似绕着M96的中心打转。很明显的,M96是一个螺旋星系,而且把较明亮中心区之外的黯淡螺旋臂算进来,它的跨幅大约是10万光年,大小约莫和我们的银河系相当。


M96亦名为NGC 3368,其距离约为3千5百万光年远,是狮子座I星系群的大型成员。M96形状为何不对称其成因仍不明,或许是源自和其他狮子座I星系群成员的重力互扰,但缺少星系之间的弥漫辉光结构,则在暗示它们之间近来几乎没有交互作用。如仔细浏览这幅由哈伯太空望远镜所拍摄的主题影像之边缘区域,可见到位在更远处的背景星系。

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Spiral Galaxy M96 from Hubble 

Image Credit: ESA/Hubble & NASA and the LEGUS Team; Acknowledgement: R. Gendler

Explanation: Dust lanes seem to swirl around the core of Messier 96 in this colorful, detailed portrait of the center of a beautiful island universe. Of course M96 is a spiral galaxy, and counting the faint arms extending beyond the brighter central region, it spans 100 thousand light-years or so, making it about the size of our own Milky Way. M96, also known as NGC 3368, is known to be about 35 million light-years distant and a dominant member of the Leo I galaxy group. The featured image was taken by the Hubble Space Telescope. The reason for M96's asymmetry is unclear -- it could have arisen from gravitational interactions with other Leo I group galaxies, but the lack of an intra-group diffuse glow seems to indicate few recent interactions. Galaxies far in the background can be found by examining the edges of the picture.




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