God destroyed the world once with a Flood, and the Bible says the next destruction will be with fire at the return of Christ. God is going to send fire from heaven from several different sources; from asteroid impacts, coronal mass ejections, and from a small 2nd sun that will come close enough to Earth to burn us with its flames! Yes, there are in fact many prophecies that reveal this information, going all the way back to the Erythraean Sibyl.
These prophecies tell us what the "signs in the sun, moon, and stars" will be before the global destruction hits us. Today we look at a conjunction of planets or blood moons as signs, but they are not signs of the end of the world, because those things have happened many times before and will happen again. No, the signs that Jesus told us about are astonishing, and shocking. Like the prophet Joel said, there will be "wonders" in the sky.
This book also presents powerful evidence that a nuclear war will cause the world to be covered with dark clouds, threatening to plunge the world into a nuclear winter. This is the cause of the darkness and clouds at the return of Christ, and the Three Days of Darkness, prophesied mostly, but not only, by Catholics. The three days are the first three days of what will be nuclear winter, except Christ returns with fire that will burn up the black clouds and saves the world. But that fire will itself kill many people.
It will be the Day of Judgment for sinners, but the Day of Salvation for the righteous who are alive on Earth. Many people will repent too late to make the Rapture, and it is these who will continue the human race in the Kingdom of God on Earth.
This book is filled with many prophecies from the Book of Enoch, Sibylline Oracles, Apocrypha, Pseudepigrapha, and even Catholic and Protestant prophecies. It was written to warn God's people to prepare in advance, so that they can better survive those terrible days that include the Great Tribulation and the Wrath of God at the end.