My new approach to quantum gravity shows that the Universe is the net effect of multiple levels of universes. I'll shows that my new approach to quantum gravity also provides a new approach to the physics of the dark matter and dark energy. I'll prove that the non-ordinary matter and energy contributions from multiple levels of universes make up the dark matter and dark energy. I'll not only provide a mechanism for the dark matter and dark energy but also show why the dark matter and dark energy constitutes the overwhelming portion of the overall matter and energy content of the Universe. I'll use my new approach to quantum gravity to show that matter and energy exists everywhere in the Universe setting the stage for my proposal for the generalized Hawking entropy and temperature not only for black holes but also for non-black hole spacetimematter regions. I’ll first derive the classical Hawking entropy and temperature from my new approach to quantum gravity and then add higher order corrections to them and also generalize them to non-black hole spacetimematter regions in addition to black holes. I’ll also use this approach to provide theoretical calculation for the Universe entropy and temperature. Finally, I’ll show that the vacuum quantum fluctuations of multiple levels of universes contribute to the cosmological constant and use this to provide a new approach to the calculation of the cosmological constant.