Nothing is a deep concept. It’s been the basis of much argument. So is empty space nothing? Apparently not! There are atoms there, there is radiation. Space according to Krauss is unstable. Combined with gravity, empty space can produce real particles. So where did the space come from? When quantum mechanics is applied to space, its properties say that space can fluctuate in and out of existence. So from no space, can space come and time within it? And there are even more forms of nothing.
Lawrence Krauss discusses his ideas surrounding nothing, and these are explored further in his book, A Universe From Nothing. He says the exciting thing about science is it makes us reassess our views and question our definitions.