[酷图] 来自回飞棒星云的冷风。

Cold Wind from the Boomerang Nebula
Credit: R. Sahai and J. Trauger (JPL), NASA/ESA
Explanation: A cold wind blows from the central star of the Boomerang Nebula. Seen here in a detailed false-color image recorded in 1998 by the Hubble Space Telescope, the nebula lies about 5,000 light-years away towards the grand southern constellation of Centaurus. The symmetric cloud appears to have been created by a high-speed wind of gas and dust blowing from an aging central star at speeds of nearly 600,000 kilometers per hour. This rapid expansion has cooled molecules in the nebular gas to about one degree above absolute zero - colder than even the cosmic background radiation - making it the coldest region observed in the distant Universe. Shining with light from the central star reflected by dust, the frigid Boomerang Nebula is believed to be a star or stellar system evolving toward the planetary nebula phase.

冰冷的星風從回飛棒星雲(Boomerang Nebula)中央的中心星不停吹出來。 回飛棒星雲位在南天的半人馬座(Centaurus)內，距離我們約有5000光年，上面這張影像是哈伯太空望遠鏡在1998年所拍攝的假色影像。 這團具有對稱性的雲氣，是由逐漸老化中心星所吹出的高速雲氣和塵埃風所形成的，這種星風的速度高達每小時六十萬公里。 高速星風所造成的快速擴張，也使雲氣分子的溫度降到只比絕對零度高一度而已。它們的溫度甚至比宇宙背景輻射的溫度要低，讓它成為遙遠宇宙最冷的區域。 冰寒的回飛棒星雲會發光，是因為它塵埃反射了來自中心星的星光，天文學家認為它是正在演化到行星狀星雲階段的恆星或恆星系統。

有点像蝴蝶星云？

有点像蝴蝶星云？
meteorobs 发表于 2003-2-21 12:02

                               
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是有点像，就是温度不一样