颜色：环状星云与恒星
(原标题: Colors: Ring Nebula versus Stars)
2021-07-21
浏览次数: 29
如果你能单独看到魔戒的所有颜色呢？周围的恒星呢？有技术可以做到这一点。这张特色图片通过这种技术显示了环状星云（M57）和附近的恒星：在这种情况下，是一个棱镜状的衍射光栅。环状星云只被看到几次，因为它发出的光主要只有几种颜色。发出的两种最亮的颜色是氢（红色）和氧（蓝色），在图像中心的左侧几乎重叠。中间右边的图像是通常看到的颜色组合图标。另一方面，恒星发出的大部分光都是可见光谱上的颜色。这些颜色结合在一起，形成了一条几乎连续的条纹——这就是为什么恒星会伴随着五颜六色的条纹出现。把物体的光分解成不同的颜色在科学上是有用的，因为它可以揭示组成物体的元素，物体运动的速度，以及物体的距离。
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What if you could see, separately, all the colors of the Ring? And of the surrounding stars? There's technology for that. The featured image shows the Ring Nebula (M57) and nearby stars through such technology: in this case, a prism-like diffraction grating. The Ring Nebula is seen only a few times because it emits light, primarily, in only a few colors. The two brightest emitted colors are hydrogen (red) and oxygen (blue), appearing as nearly overlapping images to the left of the image center. The image just to the right of center is the color-combined icon normally seen. Stars, on the other hand, emit most of their light in colors all across the visible spectrum. These colors, combined, make a nearly continuous streak -- which is why stars appear accompanied by multicolored bars. Breaking object light up into colors is scientifically useful because it can reveal the elements that compose that object, how fast that object is moving, and how distant that object is.