More like Antinomy

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Imperial EarthNovel
Arthur C. Clarkestandalone novel1975
About cloning and space exploration, set in far future.
“The plot follows the protagonist, Duncan Makenzie, on a trip to Earth from his home on Titan, in large part as a diplomatic visit to the U.S. for its quincentennial in 2276, but also to have a clone of himself produced.”
from the catalogue
The Man Who Fell to EarthNovel
Walter Tevisstandalone novel1963
Sad in tone, about aliens, set in mid 20th century and north america.
The Boat of a Million YearsNovel
Poul Andersonstandalone novel1989
About immortality and identity.
Odd JohnNovel
Olaf Stapledonstandalone novel1935
Challenging in tone, about genetic engineering, set in early 20th century.
Sirius: A Fantasy of Love and DiscordNovel
Olaf Stapledonstandalone novel1944
Sad in tone, about uplift and identity, set in mid 20th century.
“A sense of existential questioning suffuses the book, as the author delves into aspects of Sirius's psyche.”
from the catalogue
A Different LightNovel
Elizabeth A. Lynnstandalone novel1978
Space opera, bittersweet in tone, about space exploration, set in far future.
“Twenty if he stayed in space-normal, where his disease could be treated.”
from the catalogue