Can you recommend some good/well-made space sci-fi films?

I am wondering if anyone knows of any films that deal with outer space/extraterrestrials/life in the universe/UFO’s/etc. I still think the original “The Day the Earth Stood Still” is untouchable. And “2001: A Space Odyssey”...well, ditto. If you know of any documentaries dealing with UFO’s that are good quality, that would be welcomed,too.

I would like suggestions for films that feature outer space (classics or otherwise) as long as the drama is character-driven and not filled with violence. Are there any contemporary works that you recommend?

Please don’t give away the endings…:) if you have a suggestion.

Thanks so much!