Infinity was invented to account for the possibility that in a never-ending universe, anything can happen. Life on other Earth-like planets, for example, is possible in an infinite universe, but not probable, according to a scientist from the University of East Anglia.
The mathematical model produced by Prof Andrew Watson suggests that the odds of finding new life on other Earth-like planets are low because of the time it has taken for beings such as humans to evolve and the remaining life span of the Earth. Structurally complex and intelligent life evolved late on Earth and this process might be governed by a small number of very difficult evolutionary steps.
Prof Watson, from the School of Environmental Sciences, takes this idea further by looking at the probability of each of these critical steps occurring in relation to the life span of the Earth, giving an improved mathematical model for the evolution of intelligent life.