As the earth around us becomes increasingly cluttered, it’s reassuring to believe the skies above us will continue to be orderly, neat and pristine. Like most residents of fly-over land, we expect to see the wispy, white trail of a jet flying from one coast to another or hear the sputter-sputter of a crop duster. Other than those few interruptions, we can see no more than the varying colors of the skies, a moon, a sun, rainbows and a scattering of stars. That could all possibly change with the addition of outsized billboards, designed to orbit the earth while still being visible to the naked eye. That’s why the Federal Aviation Administration proposed last month that it be allowed to enforce a yet unwritten law that prohibits "obtrusive" advertising in zero gravity. According to the FAA, outsized billboards placed in low Earth orbit could be as large as the moon and could hinder astronomers. "Large advertisements could destroy the darkness of the night sky," an FAA spokesman told Reuters. On a larger scale, billboards adrift in space might change the way we look at our culture and how we rank astronauts among the world’s riskiest career choices. It will be a sad world when the last thing to go through an astronaut’s mind would be a gigantic billboard for a popular brand of mouthwash. If we continue introducing satellites and eventual billboards into outer space, we will someday be unable to distinguish between natural and man-made objects up there. Nursery rhymes and even popular songs will have to be rewritten. We will teach our grandchildren the words to "Twinkle, twinkle, little billboard" and "Billboard light, billboard bright, first billboard I’ve seen tonight — I wish I may, I wish I might have the wish I wish tonight." The little ones will also have to be taught, "Hey diddle-diddle, the cat and the fiddle, the cow jumped over the billboard." It might not sound quite as catchy as the original version, but change happens. Jiminy Cricket will have to reappear and sing, "When you wish upon a billboard," and someone resembling Judy Garland will have to record, "Somewhere Over the Billboard." Other songs to be rewritten might include, "By the Light of the Silvery Billboard", "Billboard Glow" and "Billboards fell on Alabama Tonight." The billboards will reflect advances in space travel and how we look at the ever-shrinking world around us. We might expect to read, "401,000 miles to Wall Drug" and "Fill up now! Last rocket fuel stop for next 50,000 miles." Rest stop areas will be reported to be light years apart. Roadside Burma Shave signs, which entertained us in the 1950s, might stage a comeback with series of space-side signs placed every 10,000 miles for space travelers. For those unfamiliar with the Burma Shave signs, here’s an example of what once appeared on a series of five signs: "Doesn’t she kiss you — like she useter? Perhaps she’s seen — a smoother rooster! Burma Shave." Humor was more simple then. Although the Burma Shave signs were eventually discontinued, the shave cream people must have foreseen an era of orbiting billboards in outer space when they parodied, "Twinkle, twinkle — one-eyed car — we all wonder — where you are! Burma Shave."