The title, Another Earth, clearly states the film's premise - that, mysteriously, a duplicate Earth with a duplicate population and history appears in our sky - but the film is not an sci-fi adventure. It's a study in human mistakes and their aftermath. Beautifully photographed and acted, this slow, thoughtful film sees the parallel Earth as a chance to try to "fix" the un-fixable.
A parallel Earth is a perfect speculative fiction idea. But the speculation is not science fiction's "What if?" but regret's "If only..."
Love it, hate it, Another Earth is a great starting point for after-the-movie-theater conversation in the pub. The movie theater is my favorite, The Angelika at Mockingbird Station, the pub is Trinity Hall, next door. Order the bread pudding.
