Ok so you say Dark matter is propelling the Earth right? well what is causing the sun to stay where it is AND circle the over the Earth for no reason.
The sun was constructed by NASA and circulates on a government-designed path on very thick cables made from alloys hidden from the public for centuries but known to The Conspiracy since they started time-traveling back in 422 B.C. after building a series of Egyptian and Mayan pyramids to help power the sun.
But now the sun is powered via free energy on a self-perpetuating generator contained in its core and housed in crystal from the planet Krypton. It is a well known fact that Superman actually lives in the center of the sun and has lived there since the week after Lex Luthor secretly planted vast amounts of kryptonite at key locations around the globe. This is why NASA had to help create Spiderman (to pick up the superhero crime-fighting slack), because Superman is now unable to visit most portions of the globe. NASA had to get rid of him because he was going to expose the Ice Wall. Only NASA knows where the kryptonite is hidden, and they want it there, so Superman is screwed. Fortunately, the core of the sun has pseudollite television and a good air conditioner, so at least he's comfortable. Wonderwoman flies in on her invisible plane from time to time to keep him company, of course -- but only because NASA allows it and she's agreed not to expose the Ice Wall.