The universe is so vast that it is quite literally impossible to comprehend. Yet with so much unknown, there is also so much room for hypothesizing and pontificating. What is the likelihood that other earth-like planets exist? What are the chances of extraterrestrial life? What is the practical purpose of studying the universe? Dr. John Johnson, a Harvard Professor of Astrophysics, has discovered over one hundred planets. He joins the podcast to share what we do know, what we don't know, and what we can postulate about the cosmos.