马头星云和火焰星云
(原标题: The Horsehead and Flame Nebulas)
2025-09-02
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马头星云是天空中最著名的星云之一。在这张特色图片的最右边，我们可以看到橙色发射星云的黑色凹痕。马头特征是黑暗的，因为它实际上是一个不透明的尘埃云，位于明亮的发射星云前面。就像地球大气层中的云一样，这个宇宙云偶然地呈现出了一个可识别的形状。几千年后，云的内部运动肯定会改变它的外观。发射星云的橙色是由电子与质子重新结合形成氢原子引起的。图像的左下方是火焰星云，一个橙色的星云，也包含复杂的暗尘埃细丝。
查看原文解释
The Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the orange emission nebula at the far right of the featured picture. The horse-head feature is dark because it is really an opaque dust cloud that lies in front of the bright emission nebula. Like clouds in Earth's atmosphere, this cosmic cloud has assumed a recognizable shape by chance. After many thousands of years, the internal motions of the cloud will surely alter its appearance. The emission nebula's orange color is caused by electrons recombining with protons to form hydrogen atoms. Toward the lower left of the image is the Flame Nebula, an orange-tinged nebula that also contains intricate filaments of dark dust.
© Daniel Stern