There's some cool science fiction / conspiracy theory out there about antimatter reactors and stable Moscovium 115. Our part of the galaxy is a desert for stable heavy elements.
An evil alien (Vogon, FWIW) mining company came through a zillion years ago, and stripped our part of galaxy of every last atom of precious unobtainium, leaving poor humanity stuck in the galactic equivalent of the Stone Age forever?
Sans the lore; look into interviews with Bob Lazar, both from the 80's and recently. His story hasn't changed in decades, and he has nothing to gain from it financially, at least that I can tell.
Also, his wikipedia page has been edited into a hit piece against him, which makes the story even more interesting.
He predicted the discovery of Moscovium 115 before it was synthesized in an unstable form by Russian scientists. He claimed (and claims) that a stable form of element 115 is the "fuel" in antimatter reactors. It's an intriguing story. There's a Joe Rogan podcast interviewing him.
