Daleka Tęcza by Борис Стругацкий, Борис Натанович Стругацкий (The Noon Universe, #3)

Far Rainbow (Russian: Далёкая Радуга, romanized: Dalyokaya Raduga, pronounced [dɐˈlʲɵkajə ˈradʊɡə]) is a 1963 science fiction novel by Soviet writers …