To perform a "speed-up" (from Infinity and the Mind), and cross a first order infinity (aleph-null) in a finite amount of time, and then keep going up. One end of the universe can be reached from the other end in a finite amount of time, obeying the limit at the Speed of Light, as long as two conditions are considered: 1) time stops at the speed of light, and 2) you have an infinite amount of fuel.