system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Why are humans so seemingly backwards and behind the rest of the galaxy?

In GOG we've seen that there are many other humanoid species in the galaxy, including Xandarians who appear identical to humans. All of these humanoid species have achieved interstellar travel and are intergalactic civilizations with the Kree and Xandarians owning interstellar empires. 

How is that Humans (Terrans) have barely made it off of Earth, and are even considered uncivilised by Asgardians? What is it these other species have? Is there anything biological different about Xandarians that give them an edge?
gpt
Well you're getting a view of the galaxy based on the adventures of the Guardians. They aren't spending their time on remote planets without advanced technology, so you're not going to see planets without galactic travel. As we've seen from the rest of the Guardians, it isn't as if alien species are miles ahead of human intelligence, so it may be as simple as factors like resources, time, and alien intervention behind the differences in advancement.