The Chances of Life in Our Milky Way

Our planet hunters, the extrasolar planet or exoplanets researchers have been finding over the last 20 years. We've found planets orbiting other suns in our galaxy. And what the statistics telling us now is if there's around 400 billion stars in our galaxy, there's probably an even greater number of planets of worlds orbiting those stars. So comes the question with so many prospective planets throughout even our own milky way: What are the chances that life is out there?