Humans in space
I was wondering why there are so many human-looking people in space in movies like Guardians of the Galaxy, like the Xandarians, the people on Knowhere, the Ravagers, etc. When I looked it up, Google says it’s because of the Celestials, which actually makes a lot of sense since they created life across the universe. The Eternals weren’t human, but they were made with human forms, so that kind of supports the idea.
Because of that, I think the “humans” we see in space—other than Carol Danvers and Peter Quill, who are actual Earth humans—are really just different species of humans. There used to be multiple human species in real life, but they all died out, so I’m thinking something similar happened in the MCU, like with the Kree or Skrull, who are extremely human-like. The space humans probably don’t look that different because their environments aren’t that different from Earth’s. For example, Xandar has slightly higher gravity than Earth, which means they’d have to be pretty similar to us biologically. That would also explain why Quill can breathe their atmosphere without any kind of mechanical help.
Because of that, I think the “humans” we see in space—other than Carol Danvers and Peter Quill, who are actual Earth humans—are really just different species of humans. There used to be multiple human species in real life, but they all died out, so I’m thinking something similar happened in the MCU, like with the Kree or Skrull, who are extremely human-like. The space humans probably don’t look that different because their environments aren’t that different from Earth’s. For example, Xandar has slightly higher gravity than Earth, which means they’d have to be pretty similar to us biologically. That would also explain why Quill can breathe their atmosphere without any kind of mechanical help.
Commentaires
Most of them aren't related to each other, it's just that a torpedo-shaped body with fins on the back/sides/stomach/tail just so happens to be one of the most efficient ways of moving through water, and so all those species evolved independently of each other into an optimally-moving life form.
In the comics the celestials are often interfering with the development of life across the universe and guided many species in their own image so I'd imagine the humanoid form is the end result of their tampering. So it's not so much that aliens look human but that humans and many other alien races look like a template crafted by the celestials.