Originally Posted by Zinc Saucier
About Nornheim, something that's bugged me is in the first film after Thor falls to Earth he starts asking where he is and names off Alfheim and Nornheim. Now why would he think he might be on Nornheim after going through the Bifrost if Nornheim is part of Asgard? Unless maybe it's not in the MCU. I can't remember if he names it in the scene where he explains the Nine Realms to Jane too, but it still seems to imply it's a separate planet.
He didn't say "Nornheim" in that quote when he first arrives on Earth; he said "Niflheim." Which is definitely a separate plane, or world.