【斯必泽】为什么星系看起来都这么圆滑
本帖最后由 江涛 于 2009-5-1 22:10 编辑http://ipac.jpl.nasa.gov/media_images/sig09-006_Sm.jpg
This latest image from NASA's Spitzer Space Telescope is of the spiral galaxy, NGC 2841. Located about 46 million light-years from Earth in the constellation Ursa Major, this spectacular galaxy is helping astronomers solve one of the oldest puzzles in astronomy: Why do galaxies look so smooth, with stars sprinkled evenly throughout? An international team of astronomers has discovered that rivers of young stars flow from their hot, dense stellar nurseries, dispersing out to form the large, smooth distribution that we see in spiral galaxies like this one.
This image is a composite of three different wavelengths from Spitzer's infrared array camera . The shortest wavelengths are displayed in blue, and mostly show the older stars in NGC 2841, as well as foreground stars in our own Milky Way galaxy. The cooler areas are highlighted in red, and show the dusty, gaseous regions of the galaxy. Blue shows infrared light of 3.6 microns, green represents 4.5-micron light and red, 8.0-micron light. The contribution from starlight measured at 3.6 microns has been subtracted from the 8.0-micron image to enhance the visibility of the dust features.
1750x940
http://ipac.jpl.nasa.gov/media_images/sig09-006.jpg
转自斯必泽
这段英文应该很简单，就不翻译了。。。 转自钱德拉？但这个一开始就说是斯皮策卫星的红外图啊。 脑子短路了。。。 内部精细结构一览无余::070821_04.jpg::
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