"hard" SF is often about the physics being right. Dragon Egg is a good one: you get the effects of gravity around a neutron star but no details about some scien

"hard" SF is often about the physics being right. Dragon Egg is a good one: you get the effects of gravity around a neutron star but no details about some scientific vessel hardware. Or with the revelation space cycle where the speed of light is a limit so you get multiple totally different society on different planets.