Interesting, thanks! I get the impression from the wiki article that, so far, these are well-studied but rejected theories re: sources of petro and gas on eart

Interesting, thanks! I get the impression from the wiki article that, so far, these are well-studied but rejected theories re: sources of petro and gas on earth. It's unclear to me, though, whether that's because of essential reasons that would apply to other systems, or just a historical happenstance specific to earth.