Some people seem to be interested in moving from fantasy settings to SF settings.

 In order to help them, here's a list of products that can help people set up and run good SFRPG universes.

http://rpg.drivethrustuff.com/product_info.php?products_id=16696&it=1

http://rpg.drivethrustuff.com/product_info.php?products_id=59793

http://rpg.drivethrustuff.com/product_info.php?products_id=17889&it=1

http://rpg.drivethrustuff.com/product_info.php?products_id=20447&it=1 This one's free.

http://rpg.drivethrustuff.com/product_info.php?products_id=20449&it=1
So's this one.

Note that while some products are linked to a specific system, the general advice they give on the topic of creating and running a SFRPG universe is..universal.

There are a couple major books aimed at helping GM's get going. Starhero by hero games and gurps space. Both are big, expensive and possibly too much for a starting SFGM The ones above are smaller, more focused on the basics a beginner needs and less intimidating, plus they lack a lot of extraneous details like calculating a space bodies albedo or black body radiation that most GMs have no use for.

Quote from: Cylonophile;384453http://rpg.drivethrustuff.com/product_info.php?products_id=17889&it=1

Though it's a low-budget product if there ever was one, I had a lot of fun using that in a Traveller20 game. It had some interesting and bizarro ideas.

Quote from: Caesar Slaad;384478Though it's a low-budget product if there ever was one, I had a lot of fun using that in a Traveller20 game. It had some interesting and bizarro ideas.

Yes, a lot of the weapons in it were justifiable in traveller, some obviously weren't. All in all an excellent product and, despite its cheap, homemade on a free 3d modeller art, well worth getting.

Some of the offhand notes on some of the weapons could be a springboard for a decent GM to create an entire world or campaign. The notes in "Idiot guns" were worth their weight in gold, and the idea of a "particularly callous of mercantile society" selling disposable pistols out of vending machines makes one think of such a world...

Of course the best aid for a SFGM aspirant is to actually read some good SF novels. Anyone care to offer suggestions?

Ringworld.
The Eternity artifact.
The forever war.
Hammer's Slammers.