To know for sure weather Dark Energy will dominate or not, we have to know exactly how fast our universe is expanding. Previously it is assumed our universe is expanding at constant speed. But we know now that in fact our universe is accelerating. So now we know that our universe is expanding but don't know how fast. Hubble Telescope has created a way for the scientists to solve this problem. By imaging the cosmos with greater precision, they can estimate the rate of expansion. With the help of clearer image from Hubble it is very much possible.