Instead of only one solar power revolution the world will see four different ones, each complementing the achievements of the previous ones. The technologies of the third and fourth solar power revolutions could also be used for searching radio messages sent by extraterrestrial civilizations.The Great Visionary of Finnish fiction and non-fiction has never been as breathtakingly visionary as in this volume. Risto Isomäki is science and science fiction writer whose books or short stories have been published in some twenty different languages.