The compelling conclusion to James Blish's SF classic CITIES IN FLIGHT
When the scientists of the wandering planet, journeying through inter-galactic space, heard the sound of hydrogen atoms coming into existence out of nothing, they realized that they had accidentally discovered the birthplace of continuous creation. They had lifted the curtain and caught an instant's glimpse of the unknowable. But to have looked it full in the face could have been no more fatal. For later, much later, they were to learn that they had also uncovered mankind's Day of Judgment . . .
James Blish (1921-75) studied microbiology at Rutgers and then served as a medical laboratory technician in the US army during the Second World War. Among his best known books are Cities in Flight, A Case of Conscience, for which he won the Hugo in 1959 for Best Novel, Doctor Mirabilis, Black Easter and The Day After Judgement.