The Universe is still a place of mystery and wonder. As a cosmologist, I am exhilarated that we can make some progress towards tackling what seem very fundamental questions.These programs focus on: Was there a beginning? Whether we are alone? What's the future of the cosmos?What is the nature of reality? With each advance, new questions come into sharper focus. The key issue is what we still don't know.Are we alone?Sir Martin explores the possibility that life exists on planets beyond our own. He unveils an unsettling scientific debate that has startling consequences for us Earthlings. Do you believe in aliens? If not, a quick glance through these pages might change your mind!