I only know of this from an old Vsauce video.
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I know it from Frederick Pohl's Heechee saga.
Not to be confused with ball lightning which is also Kugelblitz in German. ~~Funnily, the German Wikipedia lacks an article about the astrophysics phenomenon.~~
It doesn't, you just have follow the link to the disambiguation page: https://de.wikipedia.org/wiki/Kugelblitz_(Begriffskl%C3%A4rung)
There you will find this article linked: https://de.wikipedia.org/wiki/Geon_(Astrophysik)
Thank you. Then, obviously just the link is missing.
That was my point, it's not. It's on the top of the https://de.wikipedia.org/wiki/Kugelblitz article, right under the header.
Usually, you can click on the 'language icon' (Chinese letter + A) and select a version in another language of the article you'd like to read. This would redirect from the English Wikipedia article Kugelblitz (astrophysics) to the German one on Geon (Astrophysik). This is the link, which is missing, I was talking about.
Oh I see. And I think I figured out why the link is missing: https://en.wikipedia.org/wiki/Geon_(physics)
Ah, thank you. As the German article suggests, the Kugelblitz is a special case of a Geon and, as the English Wikipedia has two separate articles on both phenomena and inter-Wiki linking probably has to be bijective, the German article is linked from Geon, but not from Kugelblitz.