Quasars are linked to black holes, but they’re probably not white holes. The energy spectrum is wrong. They are generally believed to be caused by the screams of matter as it falls into supermassive black holes at the centre of galaxies. https://en.wikipedia.org/wiki/Quasar.

One of the Big Questions that nobody really knows the answer to is “Is time reversible” or “does the universe still work if time runs backwards?” and if not, why not? One possible answer has to do with increasing entropy, and the amount of information in the universe. If black holes (or something else) destroy or lose…