My latest conspiracy theory is that in fact, we are the aliens. We crash landed here w/ the meteorite that killed the dinosaurs, then took over the planet, and largely forgot about our origins. And because we are an invasive species, we killed this planet.
https://www.sciencenews.org/article/all-of-the-bases-in-dna-and-rna-have-now-been-found-in-meteorites
https://www.sciencenews.org/article/all-of-the-bases-in-dna-and-rna-have-now-been-found-in-meteorites
