When I was younger I remember hearing about the discovery of a new planet dubbed Planet X. At the time I heard about this “Planet X” it was supposed to be the tenth planet in our solar system. But then, as time went on, I never heard about it again. The years went by and I forgot about Planet X. It’s like it exited the galaxy without a goodbye. And then it seemed there was this resurgence in the name or in the very concept of Planet X. A band came out with name Planet X that got my attention and then two films came out that dealt with a rogue planet: Lars von Trier’s “Melancholia” and Mike Cahill’s “Another Earth.” So whatever happened to this new planet that seemingly came and went? Whatever happened to Planet X?