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什么是蓝月

What is a blue moon? | Natural History Museum

‘Once in a blue Moon’ is a popular phrase
千载难逢是一个很流行的俚语
But where on Earth did it come from?
但他到底是出自哪里
A blue Moon can refer to when we have more
蓝月亮是指我们在一个月内
than one full Moon in a calendar month,
不止有一个满月的时候
which can occasionally happen, about once every two years.
这种情况大约每两年会发生一次
But it can also happen
但是这种现象发生时
that the Moon actually appears a different colour than normal.
月亮通常会显现出与平常不一样的颜色
So the moonlight we see is reflected white light from the Sun.
所以我们看到的月光是来自太阳光的折射
And if there’s something
如果有什么东西
in the way that blocks the red light,
挡住了红色的光线
the Moon can appear blue.
月亮就会呈现出蓝色
That can sometimes happen after volcanic eruptions,
他们有时会发生在火山喷发后
for example Krakatoa in 1883, the Moon was blue for over a year.
例如1883年的喀拉喀托火山 蓝月亮持续了一年多
The ash from the volcano was just the right size
火山喷出的火山灰大小正好
to block the red light and the Moon appeared blue.
足够挡住红色光线从而月亮看起来是蓝色
We even know instances where the Sun can appear blue
我们甚至都知道有些太阳呈现蓝色的例子
due to particles from forest fires or volcanoes.
是由于森林火灾或火山产生的微粒

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视频概述

对于蓝月形成原因的简单科普

听录译者

收集自网络

翻译译者

西蜀霸王

审核员

审核员 RN

视频来源

https://www.youtube.com/watch?v=5C26yLkS3Ds

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