宇宙拿铁：宇宙的平均颜色
(原标题: Cosmic Latte: The Average Color of the Universe)
2024-12-01
浏览次数: 24
宇宙是什么颜色的？更准确地说，如果整个天空都被抹去，最后的混合会是什么颜色？当试图确定附近星系中常见的恒星时，这个异想天开的问题就出现了。这里所描绘的答案是有条件地感知到的米色阴影。用计算机术语来说：#FFF8E7。为了确定这一点，天文学家计算了一个被分析的较大星系样本发出的光的平均值：2dF星系红移调查的20万个星系。由此产生的宇宙光谱在电磁光谱的所有部分都有一些发射，但只有一种可感知的复合颜色。在过去的100亿年里，这种颜色变得不那么蓝了，这表明更红的恒星正变得越来越普遍。在一场更好地为颜色命名的比赛中，值得注意的参赛作品包括skyvory、uniige和获胜者：cosmic latte。
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What color is the universe? More precisely, if the entire sky were smeared out, what color would the final mix be? This whimsical question came up when trying to determine what stars are commonplace in nearby galaxies. The answer, depicted here, is a conditionally perceived shade of beige. In computer parlance: #FFF8E7. To determine this, astronomers computationally averaged the light emitted by one of the larger samples of galaxies analyzed: the 200,000 galaxies of the 2dF Galaxy Redshift Survey. The resulting cosmic spectrum has some emission in all parts of the electromagnetic spectrum, but a single perceived composite color. This color has become much less blue over the past 10 billion years, indicating that redder stars are becoming more prevalent. In a contest to better name the color, notable entries included skyvory, univeige, and the winner: cosmic latte.