The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at You Know, That Thing Where.
close, but not quite—I'm specifically looking for one that would include the Midnight planet "turning out" to be real. maybe another way of looking at it could be that it's like "Funny Aneurysm" Moment but without it being that a joke becoming less funny because it actually happened and was a tragedy when it DID happen. more to the effect of "Oh, that's interesting. This work of fiction has something in it that was completely fantastical and then they found something alot like it in real life!" (i'd say that Aluminum Christmas Trees qualifies more for things that already existed and were known at the time but most don't know them anymore)
True, I was actually looking for something similar, myself. (But in-universe)
Currently Working On: Incorruptible Pure Pureness
i do believe that's the one that i was thinking of, Florestan. thanks!
^ That only works if someone actually makes a planet made of diamonds (that's what the "imitates" part implies). If it's just discovery, that'd be Accidentally-Correct Writing.
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
I'm almost certain that this is already a trope but cannot for the life of me remember what it's called. The best context I can provide for this is the Doctor Who episode "Midnight", set on a planet made of diamonds, and then some time after the episode aired astronomers found a real planet made of diamonds.