The Impossibility of a White Hole

We don't know if white hole exists in the universe or not. We would expect that what spits out is just ordinary matter radiation, more likely, like electromagnetic radiation. Calculations suggest that what could come out is very low energy radiation. It could be another of the signals that one might search to identify the existence of these objects. Until we're actually seeing them or seeing an effect of them or a consequence of them, we have to consider white hole, hypothetical ideas.