The trailer probably told us everything..

A lot of trailers have been doing this and it irks me.

My first thought too, the trailer pretty much shows the entire story or enough to figure out what happens as it doesn't seem to have much depth.
Stop me if I'm wrong.

Boy born on Mars chats with girl on earth, for some reason nobody knows someone was born on mars, he is an annoying teenager so insists on going to earth, body can't handle it, oooohhhh will he die, no of course not, he finds dad, gets girl, they both go back to mars.

Yawn.