Earth: Your oasis in space
This one is a bit unexpected: Earth. But even space travelers sometimes need to come back home, and this poster showing a man and a woman relaxing without needing their spacesuit helmets makes our planet seem quite appealing.
The text says: “Earth: Your Oasis in Space. Where the air is free and breathing is easy.”
It's a good advertisement for protecting our planet, because even in faraway futures, we’ll never feel as home anywhere else as we do here.