One prominent scientist argues in a new book, controversially, that time is real. Even if it is not tangible, mass cannot evolve without time.. and without mass, time has no function. That is not exactly what he is saying, I am just paraphrasing and sharing my opinion. Time is a very odd concept if you think about it hard enough. Time is relative to where you are, and is part of space. Time warps as light does when around large amounts of mass, how so is it an illusion?