Outer space is open for business. It's a booming $50 billion a year industry - and growing so fast that not even the sky is the limit. Few of us give a thought to the myriad satellites bobbing abound thousands of miles above our heads. But watch TV, the internet, weather forecasts, international phone calls and stock market trades. As space becomes increasingly commercialized and militarized, are we allowing the dangers to outweigh the potential benefits?