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一个空间站穿过一个繁忙的太阳

(原标题: A Space Station Crosses a Busy Sun)

2022-04-11

浏览次数: 12

通常情况下,国际空间站只有在晚上才能看到。国际空间站(ISS)在绕地球运行的过程中,在夜空中慢慢飘过,每年从许多地方都能看到它的亮点好几次。因此,只有在日落之后或日出之前才能看到国际空间站,因为它是通过反射的阳光发光的——一旦国际空间站进入地球的阴影,它就会消失在视线之外。只有当国际空间站在白天从太阳正前方经过时,人们才能看到它。然后,它经过得如此之快,以至于只有短暂曝光的相机才能在视觉上将国际空间站的轮廓定格在背景太阳上。这张特色图片确实做到了这一点——它实际上是本月早些时候在中国北京拍摄的一系列照片,拍摄时机非常完美。这一系列图像后来与几乎同时拍摄的单独图像结合在一起,但突出了繁忙太阳的纹理和活动。太阳活动包括在太阳边缘看到的大量气体日珥,红色突出显示,在太阳表面看到的细丝,以及一个黑色的太阳黑子。

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Typically, the International Space Station is visible only at night. Slowly drifting across the night sky as it orbits the Earth, the International Space Station (ISS) can be seen as a bright spot several times a year from many locations. The ISS is then visible only just after sunset or just before sunrise because it shines by reflected sunlight -- once the ISS enters the Earth's shadow, it will drop out of sight. The only occasion when the ISS is visible during the day is when it passes right in front of the Sun. Then, it passes so quickly that only cameras taking short exposures can visually freeze the ISS's silhouette onto the background Sun. The featured picture did exactly that -- it is actually a series of images taken earlier this month from Beijing, China with perfect timing. This image series was later combined with separate images taken at nearly the same time but highlighting the texture and activity on the busy Sun. The solar activity included numerous gaseous prominences seen around the edge, highlighted in red, filaments seen against the Sun's face, and a dark sunspot.

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