https://www.space.com/white-holes.html
https://www.newscientist.com/article/mg24032080-100-if-you-think-black-holes-are-strange-white-holes-will-blow-your-mind/
https://earthsky.org/space/have-we-seen-a-white-hole
https://astronomy.com/news/2019/06/white-holes-do-black-holes-have-mirror-images
https://phys.org/news/2015-10-white-holes.html