Recently a report came out that found that many elliptical galaxies lack dark matter. Clearly planet X has been funneling the dark matter away from these giant elliptical galaxies for billions of years. The dark matter surrounding PX is of course the reason that we can't see it.

The New York Giants cannot hold onto a lead in a football game. Clearly football stadiums focus gravitational energy from PX which tires out the Giants defense and explains why late in the game they are suddenly as effective as a pee-wee football team.