Ok fine but if humanity is ever on the brink of extinction and this question is no longer important then we should have something ready to shoot a seed and ensu

Ok fine but if humanity is ever on the brink of extinction and this question is no longer important then we should have something ready to shoot a seed and ensure at least some form of life will expand beyond Earth. Maybe we could shoot out to several planets. I’m sure this is the premise of some sci-fi story.