Transcript: However unlikely a successful outcome a priori, SETI is based on the premise that science is an empirical endeavor. Rather than philosophizing about the possibility or prospect of life in the universe, we should look. Rather than wondering if people are communicating with us from afar, we should listen. So the rebuttal to skeptics is that we must do the experiment. In this decision making, we have decided that photons are cheaper and faster than rockets, at least with current technologies. Humans have also thrown their messages in a bottle out into space in the form of the Voyager and Pioneer spacecrafts which were laden with the images and sounds of Earth and are now drifting in outer space. Meanwhile, regardless of our intentioned efforts to communicate, we have been betraying our existence for over fifty years by the steady leakage of radio and TV signals into space. Someone looking and listening from afar could realize that there had been intelligent civilization on Earth simply by the creation and leakage of electromagnetic signals from our radio and TV transmitters. SETI is based on the premise that life in the universe exists and has become sophisticated enough to communicate somewhere, but it’s hard to say that it’s a true science because it’s impossible to estimate the probability of success of this experiment.