This is Firefly. It's a sci-fi series written by Joss Whedon that WAS on Fox until they cancelled it. (And on that day my heart made the sound of ultimate suffering.) There are fourteen episodes and one movie, called Serenity. It is freaking awesome and you should definitely look it up and watch it all. It only takes 12 hours to watch it all in one sitting. The one with the green background is Zoe and the one in the red dress is Inara. They are both amazing people, two of my favorite characters. But seriously, just watch the show.
Thank you for the answer! Honestly, I googled it after I wrote my comment, so meanwhile I know a little about it. ^^ But it sounds pretty interesting - maybe I have time to see it in winter months. I'm a receptionist in a hotel, so I don't have a lot of leisure at summer and autumn ('cause it's the time of to much overtime). :/
OMG i loved/love this show, screw FOX for f###ing it up, no wonder it didn''t get high ratings, FOX aired some of the episodes out of order...burn the land and boil the seas but you can't take the skies from me.