It would be cool if the Aliens from the Fallout 3 DLC Mothership Zeta came to Skyrim, and through word of mouth or simply someone ran up to you and was like "Dragonborn save us! blah blah blah!" and thats how it happens.

:/

where would they come from though?

There isn't any "Space" in the same terms we think of with elder scrolls.... just big holes in the sky through which magic flows.

I can't see aliens coming out of the sun...

joke?

MUUUUUUUUUUUUUUUUUUUUUURRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGEEEEEEEEEEEEEEEEEEEHHHHHH

Dude there is no space but there are somewhat "realms" I guess....

Maybe Uranus?

Forget that. It should be a portal that sends you to a post-apocalyptic world where you have to battle raiders with machine guns and men with lasers in power armor.

We already have a http://www.gamesas.com/topic/1379496-future-dlc-discussion-not-dawnguard-merged-similar-topics/