So are we all at least in the same Galaxy?

In the Marvel Cinematic Universe, everything beyond Earth lies in the cosmic realm, home to Thor (and his Asgardian family), Ronan, Thanos, the Collector, and a galaxy of people trying to snatch the all-important Infinity Stones. Two forces protect this realm: the intergalactic police force Nova Corps and the Guardians of the Galaxy, a super-team led by a talking raccoon's snark and Chris Pratt's smirk. In comic book mythology, many more heroes exist, including Quasar, Moondragon, and Captain Marvel—all of whom might have started as human but gained their superpowers through alien intervention. The comics also feature organizations dedicated to providing a safety net against potential invasion, including S.W.O.R.D. and Alpha Flight, but so far they haven't crossed over to the film universe.

Earth has a lot of superheroes. 

Earth is home to a surprising number of super-powered beings ready to fight any threat. From Captain America to Iron Man, Thor, and the Scarlet Witch, no end of heroes stands ready to defend New York or any number of fictional European locations. The bench is significantly deeper in the comic books, with characters like Ms. Marvel, Hyperion, and Squirrel Girl and superhero teams like the X-Men and the Fantastic Four that Marvel Studios (probably) can't use because other studios already have. (But then, Spider-Man crossed over, so who knows?)

Earth has a lot of street heroes, too.

Alien invasions and killer AI (coughUltroncough) aren't the only risks, and someone must protect people from more mundane but no less pernicious threats. That's the role of antiheroes like Jessica Jones, Daredevil, Luke Cage, the Punisher, and Iron Fist---characters so edgy they must remain confined to Netflix. In comic book lore, a handful of similar champions, including Cloak and Dagger, Moon Knight, and the Daughters of the Dragon, join them in thise epic fight against street-level crime.

And that's just getting started. The article goes on and on.