Spacemen was a short-lived early-1960s magazine specifically about space-themed science fiction movies. Warren Publishing — creators of the classic magazines Famous Monster of Filmland, Monster World, Creepy, and Eerie — produced only 8 issues of the magazine, helmed by Forrest J. Ackerman. The cover art is glorious (cover above by Wally Wood!) and you can find torrents of the whole scanned run of the magazine. Swapsale has a gallery of the covers. Here's an article that Ray Bradbury contributed. And dig this terrific submission letter sent to Spacemen by Stephen King, age 14.