Well, Star Trek was sold to the network as "Wagon Train to the stars", so why not Firefly as "Riverboat in space", or some such?

I loved Notting Hill, it's one of my favorite movies. Just the same, as a science fiction fan I'm always a little offended when "set in space" is used as a code to indicate a movie must be really bad. I think Julia Roberts would make a fine starship commander. :-)