The Exoverse is a barren void outside of our space and time, and is the Shadow From Beyond Time's point of origin. Atomic Robo entered the Exoverse from four different points in time, causing four versions of himself from different points in his life to exist simultaneously in the exoverse. This does not constitute time travel or the paradoxes involved because, as the elder versions of Robo explain to the youngest, they are a) outside of linear time, and b) the event is only happening once, they are merely experiencing it from different points in their lives.