面对ngc6946
(原标题: Facing NGC 6946)
2024-07-26
浏览次数: 19
从我们在银河系的有利位置，我们可以正面看到ngc6946。这个巨大而美丽的螺旋星系位于2000万光年之外，在遥远的仙王座的前景尘埃和恒星的面纱后面。在这张清晰的望远镜图像中，从核心向外，星系的颜色从中心老恒星发出的黄光变为年轻的蓝色星团和沿着松散、碎片化的旋臂形成的红色恒星区域。NGC 6946在红外光下也很明亮，富含气体和尘埃，显示出很高的恒星诞生和死亡率。事实上，自20世纪初以来，在NGC 6946中发现了10颗被证实的超新星，即大质量恒星的死亡爆炸。NGC 6946直径近4万光年，也被称为烟花星系。
查看原文解释
From our vantage point in the Milky Way Galaxy, we see NGC 6946 face-on. The big, beautiful spiral galaxy is located just 20 million light-years away, behind a veil of foreground dust and stars in the high and far-off constellation Cepheus. In this sharp telescopic portrait, from the core outward the galaxy's colors change from the yellowish light of old stars in the center to young blue star clusters and reddish star forming regions along the loose, fragmented spiral arms. NGC 6946 is also bright in infrared light and rich in gas and dust, exhibiting a high star birth and death rate. In fact, since the early 20th century ten confirmed supernovae, the death explosions of massive stars, were discovered in NGC 6946. Nearly 40,000 light-years across, NGC 6946 is also known as the Fireworks Galaxy.
© Roberto Marinoni