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From an astrophysics point of view, a white hole is the opposite of a black hole. But this is only valid conceptually, because, in practice, there is no proof of the existence of white holes in space. They are nothing more than a hypothetical consequence of the Theory of Relativity – that of Einstein himself. Complicated, right?! Let’s try, then, to put it in a simpler way, to the despair of astrophysicists. You may have heard that a black hole sucks in all the matter and light around it, causing it to simply disappear. In the past, some astrophysicists believed that this matter could enter through the black hole and appear in another universe, through a white hole. It would therefore be a kind of opposite side of the black hole: a place where energy and matter would spontaneously appear. “This theory assumes that there are other universes besides ours. But even today, the existence of these other universes is not proven. Much less that of white holes,” says astronomer Jacques Lepini, from USP. Due to the lack of proof of the existence of white holes, this subject was little by little being left behind by astrophysicists, who preferred to burn their neurons in more papable themes, although, for us mortals, no astrophysical subject seems very papable… Conclusion : in addition to not existing in practice, the white hole is disappearing in theory.