NASA 美国宇航局的每日一图 3月份
发布: 2009-1-14 17:53 | 作者: webmaster | 来源: 本站原创 | 查看: 161次
2008 March 27 
影像版权与提供: Don Goldman, Macedon Ranges Observatory 说明: 位在邻近大麦哲伦星系内的N44，离我们约有十七万光年远，大小则约有一千光年，是个由许多发射星云所聚成的巨大分子云团。N44内部炽热年轻亮星的恒星风和强烈辐射，激发四周的云气发出辉光，也雕塑出这些奇形怪状的云气丝。除此之外，短命大质量恒星死亡时所发生的超新星爆炸，可能也是这个区域有这么多巨大泡泡状结构的主因之一。例如：位在影像中心的这群年轻亮星，就位在一个直径将近二百五十光年的巨大泡泡内。为了要清楚呈现这些错综复杂的结构，这幅假色影像用各种渐层的蓝和绿，代表来自氢、氢和硫的辐射。
Explanation: A truly giant complex of emission nebulae, N44 is about 1,000 light-years across. It shines in southern skies as a denizen of our neighboring galaxy, the Large Magellanic Cloud, 170,000 light-years away. Winds and intense radiation from hot, young, luminous stars in N44 excite and sculpt filaments and streamers of the glowing nebular gas. But supernovae - the death explosions of the massive short lived stars - have also likely contributed to the region's enormous, blown-out shapes. The cluster of young stars seen near the center lies in a superbubble nearly 250 light-years across. This detailed, false-color view of the intricate structures codes emission from hydrogen, oxygen, and sulfur in shades of blue and green.
Explanation: A truly giant complex of emission nebulae, N44 is about 1,000 light-years across. It shines in southern skies as a denizen of our neighboring galaxy, the Large Magellanic Cloud, 170,000 light-years away. Winds and intense radiation from hot, young, luminous stars in N44 excite and sculpt filaments and streamers of the glowing nebular gas. But supernovae - the death explosions of the massive short lived stars - have also likely contributed to the region's enormous, blown-out shapes. The cluster of young stars seen near the center lies in a superbubble nearly 250 light-years across. This detailed, false-color view of the intricate structures codes emission from hydrogen, oxygen, and sulfur in shades of blue and green.
