In the 1970s, a black hole formula that told us what a black hole is and how it works was discovered had a second solution to it. And if that were the case, a white hole would be a highly radiant thing. Their quasars, could a white hole be a quasar? So we have no evidence for white holes. They likely don't exist. If they do, they're full of stuff that would be awesome. It's just pouring out of nowhere. That would be fun.