在夜晚决斗的乐队
(原标题: Dueling Bands in the Night)
2022-03-01
浏览次数: 14
天空中的这两条带子是什么?更常见的波段是右边的那条,它是我们银河系的中心波段。我们的太阳在这个螺旋星系的圆盘上运行,所以从内部看,这个圆盘在天空中看起来像一条亮度相当的带。银河带全年都可以看到——如果远离城市灯光的话。左边不太常见的波段是黄道光——太阳系中围绕太阳运行的尘埃反射的阳光。黄道光在太阳附近最亮,所以在日出之前或日落之后观看最好。在北方的一些晚上,特别是在三月和四月,这条黄道带在日落后会显得非常突出。直到本世纪才确定,黄道带尘埃主要是由经过木星附近的彗星排出的。只有在一年中的某些时候,这两条条带才能在天空的某些地方并排出现,就像这样。这张特色图片包括仙女座星系和一颗流星,拍摄于1月底中国四川康定一个冰冻的湖泊上。
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What are these two bands in the sky? The more commonly seen band is the one on the right and is the central band of our Milky Way galaxy. Our Sun orbits in the disk of this spiral galaxy, so that from inside, this disk appears as a band of comparable brightness all the way around the sky. The Milky Way band can also be seen all year -- if out away from city lights. The less commonly seem band, on the left, is zodiacal light -- sunlight reflected from dust orbiting the Sun in our Solar System. Zodiacal light is brightest near the Sun and so is best seen just before sunrise or just after sunset. On some evenings in the north, particularly during the months of March and April, this ribbon of zodiacal light can appear quite prominent after sunset. It was determined only this century that zodiacal dust was mostly expelled by comets that have passed near Jupiter. Only on certain times of the year will the two bands be seen side by side, in parts of the sky, like this. The featured image, including the Andromeda galaxy and a meteor, was captured in late January over a frozen lake in Kanding, Sichuan, China.
© Jeff Dai (TWAN)