Stuck in a time loop? (spoilers)
Based on the ending, we know that anyone left alive who knew what the sphere really was collectively forgot about it, and it flies off into space. And the very very end seems to indicate it makes it back into the logged "unknown event".
Given this, is it now stuck in a time loop? Obviously somehow the spaceship comes back in time to about 300 years before present day in the movie, and it's some 50 years in the future - so would it be impossible for this sphere to exist past the latest time that spaceship exists? Or would the time travel back create a new dimension?
I guess it's a philosophical question based on whatever belief of time travel one might have. The time loop scenario seems interesting, especially since the sphere never would seem to die or go away.