|Unlike NASA, I am still sending people into space.|
(Actually, that's true. My fantasy uses feet/pounds and my science fiction uses meters/...well, I generally tried to avoid specifying units. I managed to go 140k words without specifying a unit of currency, though I'm not entirely sure why. I just didn't want to get into that whole thing.)
The major adjustment is, actually, in voice. My science fiction tends to come out tight and sparse on the details -- maybe a little too sparse. My betas poke me for more. For some reason, I'm more reluctant to talk about world-building and description in science fiction. I want to get to the action, the explosions, the cool stuff.
In fantasy, I always have the feeling of OMG SHUT UP AND DO SOMETHING because my characters are less inclined to LISTEN TO ME. (Kiefan's "bad idea" from a few weeks back? Totally worked. Listen to your characters.)
But then again, I'm not getting many confusion complaints on the fantasy. Hmm.
Anyway, I was trying to hack together a post about voice and it wasn't working. I will get back to it. Maybe I will do some more world-building posts for science fiction. Your comments would be extremely influential on that, you quiet people out there. :)
On a somewhat related note, if you're writing fantasy you may be interested in the Magic Appreciation Tour proposed by Daniel Marvello. I have a long way to go on my fantasy monstrosity, but I'm interested. Maybe something similar could be done for science fiction.