Black Hole Thread Deletion Explained

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Threads can be marked as "off-topic" and removed by staff, leading to an error message indicating they have dropped into a "black hole." This process is not a database bug but a moderation action to maintain forum standards. Users cannot reply to these threads once they are deleted. The removal is typically due to violations of forum rules. Understanding this helps clarify why certain threads become inaccessible.
Delta2
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I don't know where to post this so here it goes

I ve noticed that when i go to reply to some threads i get the error message that the thread has drop into a black hole? What is happening, is it some bug of the database that deletes threats or what?
 
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No bug --- just a thread that has been deemed "off-topic" for PF.
 
Means that before you can reply, the thread has been removed by staff for a violation
 

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I want to thank those members who interacted with me a couple of years ago in two Optics Forum threads. They were @Drakkith, @hutchphd, @Gleb1964, and @KAHR-Alpha. I had something I wanted the scientific community to know and slipped a new idea in against the rules. Thank you also to @berkeman for suggesting paths to meet with academia. Anyway, I finally got a paper on the same matter as discussed in those forum threads, the fat lens model, got it peer-reviewed, and IJRAP...
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Thread 'Thank you physics forums, 20 years later'

About 20 years ago, in my mid-30s (and with a BA in economics and a master's in business), I started taking night classes in physics hoping to eventually earn the science degree I'd always wanted but never pursued. I found physics forums and used it to ask questions I was unable to get answered from my textbooks or class lectures. Unfortunately, work and life got in the way and I never got further the freshman courses. Well, here it is 20 years later. I'm in my mid-50s now, and in a...
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