Research: Sci-fi Movie Posters!

Found a good site displaying some 1930's Movie Posters - they're in Swedish, though, and not all are of the Sci-fi genre.
http://50watts.com/20-Swedish-Posters-for-1930s-Hollywood

There's also a lot more on here:
http://wheredangerlives.blogspot.co.uk/2012/12/50-greatest-classic-sci-fi-poster.html

I really like the two above, and they both fit the Sci-fi genre the most out of that webpage. The very first thing I noticed were the colours - similar to Pop Art it is limited to only a few, but in contrast blacks are used quite predominately rather than as an outline.

They both have thick borders that highlight the poster by using a contrasting colour (off white on black) and both have a large image that takes up the majority of the page. 

I haven't seen any posters so far that feature a Serif font, so I think this is representative of the Sci Fi genre - it's not really a "fancy" genre, so serifed fonts wouldn't really represent this very well. Sans-serif fonts come across bolder and easier to read, so work better in this case. 

Another style I've noticed is the way some of the text is aligned, especially the tag lines and lists of actor names. You can see this on the "not of this earth" poster - the tag line has the text aligned to the left but the words themselves are stacked one above the other, but it all still reads together and looks like a little group of text. This is also on the "Tobor The Great" poster, on the bottom left and right for the actor/crew information. 

There also seems to be a "section" on each poster that is dedicated for information, and for 3 out of 4 of the posters above there is actually a box of a different colour at the top or bottom that contains it. This seems to separate it from the poster and make sure it stands out so people don't miss the information, and makes it easy to read so it doesn't clash with the rest of the imagery.