I agree. She was stunning in that movie.
20 years later she looks much different (pictures on IMDB)
Frankly, I think any human, robot, or cyborg shouldn’t really be up for consideration; it should be aliens, or it should be “hottest sci-fi babes,” if you ask me.
But since we’re all ignoring that, and since a few people have mentioned anime chicks, I’ll give it a go. I’m no good at ordering lists, so here’s mine out of order:
Major Motoko Kusanagi from Ghost in the Shell, pretty much any incarnation of it.
Princess Leia from Star Wars (esp. in RotJ slave-girl costume)
Faye Valentine from Cowboy Bebop
7 of 9 from Star Trek: Voyager
T’Pol from Star Trek: Enterprise
Sil from Species
Tifa Lockheart from Final Fantasy VII: Advent Children (amazing CG in that movie)
Oola (Twi’Lek slavegirl) from Star Wars: Return of the Jedi (way hotter than Ayla Secura)
Leloo from the Fifth Element
PS. Note that I LOVE Farscape, but I just didn’t think of the girls from that series in the same league as the above. Also, the Xev/Zev chicks from Lexx didn’t quite make it (btw I always preferred the first one, isn’t that Zev?)
I always wondered if that was a tribute of some sort to the (now) late Adams.
Having read this, I’ll try and imagine it was Robbie who taught her while I have a cold shower. Or perhaps whoever was left of the crew before the ID creature got them all, but I’m doubting the timeline of the movie will save me 
What? Annoying gobby grey bint from Farscape gets several mentions, but no-one else likes Aeryn Sun? Not even in that very fetching tie-dye outfit from when they travel back to the seventies? 
Lifeforce - only ever seen it once, but I do remember thinking it should have been called Mammoforce.
Well, through the incredible powers of handwavium, one could imagine that she accessed the fantastic mental machinery of the D’rell, and that she learned all sort of advanced hyper futuristic sex things from their records. Yeah, that could be it!
Wasn’t “annoying gobby grey bint” supposed to be some kind of futuristic hooker or “pleasure unit” as they say in SF? In any event, I found the grey complexion way offputting – a little too corpse-like, to be exact.
Hey…I did list her as a “runner up”. 11 out of the entire universe ain’t bad.
I’m supprised not too many mentions from Serenity/Firefly. Pretty much all the gals on that ship were pretty cute.
I’m going to go crack up the wayback machine and say the gals from the original Battlestar Galactica (including a young Jane Seymour) were pretty hot.
Although I suppose in the sense, we as the audience are supposed to relate to the main characters as if they are from the same planet as we are. So basically, they are not supposed to be “alien” to us.
The weepy Viper pilot (from the Pegasus IIRC) and the tactical officer with dark hair appealed to the pubescent me 
I always had a hard spot for Daphne Auniga as the Drewish Princess Vespa in “Space Balls”.
A few others
Servalan from Blake’s Seven ,
Barbarella though it is unsure if she was born on Earth or not.
and all the females in Buck Rogers in the 25th Century tv show.
Ahhh yes. I think I know who you’re talking about. She was the Lloyd Bridges (My ear canals are very sensitive. Took a bullet on Caprica.) character’s daughter or something. I just enjoyed the fact that a super-tight jumpsuit and Farah Fawcett hair was standard issue for female officers.
Reminds me of another alien space hottie: Cissie Cameron from “Space Mutiny” of MST3K fame. Sure, she plays the world’s oldest teenager, and she kinda looks it. So why is she a space babe? Because, as Crow points out, during her dance scene 'She’s presenting like a baboon in heat!"
Oh god, that movie gave me sore ribs for days. She looked as old as her grey-haired dad, but Big McLargehuge didn’t care.
And the male Doper community continues in its quest to eliminate its image as lonely nerds who would do an alien chick if given the chance.
Placing us far higher on the totem pole than the rest of the male population, who would do Paris Hilton if given the chance. Ick.
Sikozu from Farscape. Actress who plays her ain’t too bad either.
Hilton is pretty in a certain way. Not my way, but I can imagine it.
That is, if she weren’t Paris Hilton. I honestly can’t think of a redeeming feature about dating her, except for the money.
Keep your self-loathing to yourself (noting Cardinals’ location) comic book guy.
We can play any way we wanna. You don’t like it, well, there’s the Pit for describing what you can do about it.
I don’t need more than the money.