In a previous question, I asked about why many extra-terrestrials in the MCU seemed familiar with humans, even though Earth hadn't yet had a space faring civilization, and wondered about the origin of some of the human appearing characters (e.g. Stakar, Aleta Ogord, and other Ravagers...). The response (which made sense) was:
A few stray humans (Peter Quill, Carol Danvers,...), along with the fact that the Kree had been to Earth several times were enough for the Galaxy to be aware of humans.
The human appearing characters I mentioned were all humanoid, not human.
Since the time, I posted that question, I re-watched The Avengers, and I noticed one very small detail:
At the very beginning of the movie, when The Other is explaining to Thanos that they have located the Tesseract and how they plan to retrieve it, it is located on "a human world." Not "the human world," "a human world" – implying that there are other human worlds besides Earth.
This seems to contradict the earlier response, and I am wondering if there is anything in the Marvel canon (since there are no additional details in the MCU itself) that can clarify whether in fact there were other humans in the galaxy besides the humans of Earth?
To specify the questions:
Is there anything in the extended Marvel canon that indicates that there are multiple human worlds, and not just Earth? Is there any evidence of some sort of Panspermia, or that humans migrated to Earth from other worlds?
Or did The Other just mean "humanoid" not human, since from other species perspectives the other humanoids are still more or less in the same category as humans compared to Thanos, Drax, the Chitauri, etc...?