RCW79,一个由气体和尘埃组成的宇宙气泡，在星风的吹动和炽热年轻恒星的辐射的影响下，它的半径已经扩展到了大约70光年。在这张斯必泽望远镜拍摄的假彩色图片中，来自星云内部的尘埃的红外辐射被描绘成红色。RCW79离我们大约有1万7千光年，位于南方的人马座中。当这个延展星云进入包围着它的气体和尘埃的时候，它本身也会激发恒星的形成。实际上，这幅明锐的红外图片揭示了新恒星族，就是在气泡边缘的那些微黄色的点。一个显著的族就位于它出生气泡的大约7点钟方向（左下），而另一个族则位于气泡中心3点方向。（小兔译）
A cosmic bubble of gas and dust, RCW 79 has grown to about 70 light-years in diameter, blown by the winds and radiation from hot young stars. Infrared light from the dust embedded in the nebula is tinted red in this gorgeous false-color view from the Spitzer Space Telescope. A good 17 thousand light-years away in the grand southern constellation Centaurus, the expanding nebula itself has triggered star formation as it plows into the gas and dust surrounding it. In fact, this penetrating infrared picture reveals groups of new stars as yellowish points scattered along the bubble's edge. One remarkable group still lies within its own natal bubble at about 7 o'clock (lower left), while another can be seen near the upper gap at about 3 o'clock (right) frm the bubble's center.
宇宙气泡 http://antwrp.gsfc.nasa.gov/apod/ap040819.htmlurl
斯必泽望远镜
http://www.spitzer.caltech.edu/about/earlyhist.shtml
人马座
http://www.glyphweb.com/esky/constellations/centaurus.html |
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