Peter Quill seems to have been born in 1981, and then abducted from Earth in 1988. There were therefore 7 years in which the child of a Celestial was on Earth.
Is there any indication given of whether or not Charles Xavier sensed Peter's existence?
I am not sure when Cerebro was created.
Of course, the source can be anywhere in the comics. Obviously, the movie universes are different, but many characters coexist in the comics despite being segregated in the movies.