Board Thread:Questions and Answers/@comment-5157293-20131110013820/@comment-1713281-20131112155430

Well, again, Yggdrasil dumps into Midgard at the farthest reaches of space, not a planet; Midgard is our entire universe, not just Earth, where all the action of the MCU seems to focus.

I'm also basing some of my theory on the Nine Realms on how they are depicted in Earth-616, since the MCU films can only go so in-depth without becoming a CGI geography lesson.

But as far as the ship goes, you're honestly just picking up on a plot-hole that the screenwriters never really explained, so there's no real definitive answer on that one. The odds that there was a portal large enough to move a sky-scraper sized battleship through--that just so happened to bring them directly to the outskirts of Asgard--are highly improbable, but that's what appears to happen.

This conversation has also given me desire to go rewatch the first Thor movie and re-acquaint myself with his original description of the Nine Realms to Jane.