Is there anybody out there? Is there life on other planets? If the answer is yes, and we can prove it, the physicist Jim Al-Khalili says that would be a revolutionary moment in science, up there with Copernicus proving that Earth is not the center of the universe. Considering the vastness of space, scientists mostly agree that somebody or something else is out there. Al-Khalili joins us Wednesday to explore where that life might be, what it might be like, and what would happen if we found it—or