Mårten Ericson asked this question about The Three-Body Problem (Remembrance of Earth’s Past, #1):
Is this Space opera or hard SF?
Shawn Conroy Between soft and hard science fiction, I would say this is firmly in the hard science fiction category.

When I say space opera, I usually mean deep spa…more
Between soft and hard science fiction, I would say this is firmly in the hard science fiction category.

When I say space opera, I usually mean deep space adventure. Though it's often used to mean simplistic or melodramatic. This could not be space opera because it almost all exclusively takes place on Earth.

So even crappy soft science fiction might not be space opera, in my opinion, because if it all takes place on earth it's not very spacey. (I would say Star Wars could be viewed as the most popular space opera.)(less)
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by Liu Cixin (Goodreads Author)
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