Board Thread:General Discussion/@comment-106.78.252.7-20141123113510

According to MCU, Guardians took place in 2014, but at the same time on Earth, SHIELD has not made spaceships and travelled to different planets. Peter Quill being a half Terran(ie human, if im not wrong), how can he breathe properly? Aren't most of the Xandarians humans? Aren't Nova Corps humans? How is all this possible if humans haven't stepped outside Earth??? 