For centuries mankind thought there was a distant planet out there beyond from what was already known, Planet X. Well it turns out there is a planet out there, what was once thought to be Planet X is now known as Planet 9. Professor Mike Brown from CalTech joins Dr. Pannell to discuss his discovery of the distant Planet 9. Mike Brown is a Professor of Planetary Astronomy at the California Institute of Science. He will provide some illumination on Planet 9.
http://www.caltech.edu/news/caltech-researchers-find-evidence-real-ninth-planet-49523
http://web.gps.caltech.edu/~mbrown/
Aired. Feb 26, 2017