In Guardians of the Galaxy, it appears that nearly every being in the universe is capable of speaking English. While I understand that many people prefer English over made-up languages with subtitles, I feel like there should be some explanation (e.g. Babel fish in the Hitchhiker's Guide). Is there reasoning beyond that's-how-the-comics-did-it?
There are only a few instances that I can come up with where beings spoke anything other than English (e.g. Groot, Nebula shouting orders to the Sakaaran soldiers).