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Well, it depends on how you define "unrealistic." Old sci-fi which assumed that Venus is covered with swampy jungles is "unrealistic", but not "unrealistic" in the same sense as modern sci-fi which...

Found it -- the title is Red Planet, first published 1949. The Wikipedia article notes that the native Martians here are physically and culturally very similar to the ones that would appear 12 years...

Well, unlike faster-than-light travel, it doesn't blatantly violate known laws of physics; unlike telepathy, it doesn't suppose that there is some "fifth fundamental force" completely unknown to...

Hmmm. To me, the term "soft science-fiction" in English often implies a "space opera" in which faster-than-light spaceships, time travel, telekinesis, and other very unlikely things are simply taken...