Your initial description reminded me of a movie trailer I saw a while back. It took me a while to remember the title: Another Earth . Rewatching this trailer, I guess the plot isn't the same, but in the images it looks like the two Earths could collide, which is why I thought of this trailer.

VirginiaR.
"On the long road, take small steps." -- Jor-el, "The Foundling"
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"clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.