A Russian inventor has patented ads in Space. The general idea is to create artificial constellations of reflective satellites. It is unclear if the satellites will move the mirrors to change the message, or if the satellites placement relative to one another will be the way the message is changed. Getting satellites arranged, and staying arranged will be a very interesting task since geosynchronous orbits only happen over the equator. Robert Heinlein Predicted years ago that someone would paint an iconic logo onto the moon - his idea was to use rockets to spray carbon dust over the surface of the moon.