The 40K-iverse has many planets they focus on. From those of the Sabbat world, to Cadia, Tanith, Mordia, Tallarn and so forth. For the Dark Heresy Role Playing Game the creator a new Sector to play around with and dedicated 40 pages of the core rules to it as well as a lengthy portion of its web site. Heck they even opened up and let some fans design some of the multitude of worlds for them.
And I recall the Star Wars WEG D6 RPG having many sourcebooks based on the movies that delved into things like Dagobah, Hoth and Tattoine.
In the end there is no true difference between sci-fi and fantasy settings other then how you get around. Planets like Tattoine and Cadia are just variations of "climate or terrain" for encounter tables and serve much the same role as cities like Freeport or Waterdeep do.
"Hey we have to track that rogue sorcerer down who stole the magic sword. He was here in Freeport but we need to charter a boat to Waterdeep to stop him!"
becomes
"Hey we have to track that rogue psykerdown who stole the cursed eye. He was here on Cadia but we need to charter a transport to Scintila to stop him!"
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