Another entry in the 1950s to 1980s time frame: The Songs of Distant Earth by Clarke.
https://en.wikipedia.org/wiki/The_Songs_of_Distant_Earth
> The Songs of Distant Earth is a 1986 science fiction novel by British writer Arthur C. Clarke, based upon his 1958 short story of the same title. He stated that it was his favourite of all his novels. Clarke also wrote a short step outline with the same title, published in Omni magazine and anthologised in The Sentinel in 1983.
> The novel tells of a utopian human colony in the far future that is visited by travellers from a doomed Earth, as the Sun has gone nova. The Songs of Distant Earth explores apocalyptic, atheistic, and utopian ideas, as well as the effects of long-term interstellar travel and extra-terrestrial life. The story is set in the 39th century and follows the journey of a spaceship called the Magellan as it carries a group of colonists to a distant planet, Thalassa. Thalassa is one of the few habitable planets discovered by Earth’s automated spacecraft, and it becomes a refuge for humanity facing the impending destruction of Earth due to a massive solar flare.