I watched an interesting show on PBS recently called "Exploring Space: The Quest for Life". The main gist of it was that the necessary environment for life to exist could be on Mars, or Europa (ice moon of Jupiter), or even deep in the Earth's crust, where sunlight never travels. And potentially meteorites from space have in them the kernels of life, ready to seed any place with basic elements. All life really needs to develop and survive is a will, lots of time, and energy. Even water is no longer a prerequisite. That's a big change from what I was taught in school -- back then it was thought that the environmental needs for life were, well, the Earth's surface! Maybe there is a man on the moon?
