The Planet U

I float on the surface of the planet U. There is no one here except for me, so when I say you I mean myself. Only me here on U. You try climbing up the sides of the planet U, but the edges are too steep for me, so I dig beneath the planet U. The deeper I get the darker U gets. U eventually collapses on top of me and I can no longer breath. I am part of U now. U equals me.