"A Journey in Other Worlds: A Romance of the Future" by John Jacob Astor is a science fiction novel published in 1894. Set in the year 2000, it envisions a world transformed by technological marvels: worldwide telephone networks, solar power, and space travel. American explorers journey to Jupiter, encountering a dangerous jungle world filled with monstrous creatures and vast resources. On Saturn, they meet ancient spirits who reveal troubling prophecies about their fates and describe Cassandra, a distant icy world harboring unworthy souls. (This is an automatically generated summary.)