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Studies of neanderthal DNA have cleanly eliminated the neanderthal as a plausible human ancestor, and all other hominids are much further removed from modern humans THAN the neanderthal. That eliminates the possibility of modern humans having evolved here on this planet, and leaves three choices;
For your theory to work you have to fit in the three problems listed below.
1. Genetic similarities between humans and neanderthals. Mitochondrial DNA seems to indicate that humans and neanders were genetically isolated, but the similiarities between the DNA sequences is still striking.
2. Genetic similarities between humans and chimps/bonobos/gorillas. If humans are extra-terrestrial in origin, then these apes have to be as well. The only way to make sense of the genetic similarities, both in base-base comparisons and genetic markers such as ERVs, is common ancestory. Or, with your ET theory, that they were breed or designed by the same space aliens to resemble a clade.
3. The hominid fossils which point to humans coming from an ape-like ancestor. Although the fossils we found may not be directly linked to humans through common ancestory, they nonetheless give us an idea of what hominids looked like millions of years ago. There is no denying the progression from ape like to human like morphology. Neanderthals are not the last link, there are numerous other fossils and species that point towards a common ancestory with apes.