Momo
At least in the sense I understand science fiction – which is probably more correctly described as a commentary on current society by extrapolating trends and meditating about their consequences, whether they may be good (as in StarTrek with its idealised, peaceful earth) or bad (as explored in the genre of cyberpunk).
Of course, this might exclude some other works – most notably the whole StarWars saga, which in my opinion resembles more a fantastic epos than anything else.