What movie is this?

I remember seeing previews for a movie in the last year or so that I can’t seem to find the title of. What I remember of the previews:

- a boy or a young man, enamored with space and the stars
– a girl or a young woman who lives in the same apartment building
– they fall in love
– the boy or the girl wearing an astronaut’s helmet

I wish I could remember more. It’s just a quirky love story, and I’d like to watch it, but I can’t remember the name!