你能找到彗星吗?
Can You Find the Comet?

原始链接: https://apod.nasa.gov/apod/ap260427.html

这张2026年4月27日的每日天文图片(APOD)展示了彗星C/2025 R3 (PanSTARRS) 巧妙地位于卫星轨迹网络*之后*。这些轨迹是由于10分钟的长曝光拍摄造成的,使得卫星呈现为条纹而不是移动的光点。 目前,观测这颗彗星具有挑战性,因为它在天空中靠近太阳。然而,在接下来的几周里,它将从南半球可见,然后在前往星际空间的过程中逐渐消失。彗星位于图像中心略上方——一个微弱的访客,正在穿过我们的太阳系。这张照片是在德国巴伐利亚州日出前拍摄的。

这个Hacker News讨论围绕一张NASA发布的寻找彗星的图片展开,但很快转移到对各国(俄罗斯、中国、欧盟以及现有机构)正在发射的越来越多的卫星星座的担忧。 用户们对这些星座的“双重用途”性质表示担忧——它们在未来冲突中可能成为军事目标——并希望低轨道能够减轻太空垃圾问题。虽然有些人欣赏由此产生的用于RSS订阅的天文图片,但也有人承认天文界对这些星座造成的光污染和干扰感到沮丧。 一位评论员甚至将此现象与科幻小说《三体》中虚构的强大监视技术(“智子”)相提并论。帖子还提醒了Y Combinator 2026年夏季申请的开放时间。
相关文章

原文
APOD: 2026 April 27 – Comet R3 PanSTARRS Behind Satellite Trails

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2026 April 27
A night sky filled with lines and dashed-lines 
appears above a hilly landscape featuring a distant
lit-up tower. Near the center of the image is a comet
shown by its small green coma and ion tail to the upper 
right.
Please see the explanation for more detailed information.

Comet R3 PanSTARRS Behind Satellite Trails
Image Credit & Copyright: Uli Fehr

Explanation: Can you find the comet? Somewhere through this web of satellite trails is Comet C/2025 R3 (PanSTARRS), a bright visitor passing through the inner Solar System. Now, the orbiting satellites themselves only appear as streaks because of the long camera exposure, over 10 minutes in this case. On the contrary, to the eye, satellites appear as points that drift slowly across the night sky and shine by reflecting sunlight -- primarily just after sunset and before sunrise. The featured image was taken just before sunrise two weeks ago from Bavaria, Germany. Presently, Comet R3 PanSTARRS is hard to see for even another reason -- because it is so (angularly) close to the Sun. As the comet rounds the Sun, it will be best seen in coming weeks from southern hemispheree skies, although then it will be heading out to interstellar space and fading. If you haven't yet found the comet, don't despair; please take a closer look just above the image center.

Tomorrow's picture: cometary mountains
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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
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