Synopsis

Science fiction has long featured its familiar extraterrestrials – the little green men. These humanoid beings, however, were rooted in terrestrial life, not in any actual evidence from beyond our world. Now, with the discovery of hundreds of planets orbiting distant stars, science and imagination are converging. As we begin to envision these potential Earths, we can apply real scientific principles to speculate about the biology of their inhabitants. Will they possess two eyes, two legs? What h