Planet 9 From Outer Space

In the past 175 years, more than 30 separate astronomers have suggested the existence of a giant planet beyond Neptune. They have always been wrong. In 2016, Dr. Michael Brown and Dr. Konstantin Batygin joined the list, suggesting that Planet 9, at a distance perhaps 20 times greater than that of Neptune, is the only plausible explanation for a wide range of phenomena in the distant solar system. He will talk about why they think Planet 9 is real, how they’re continuing to develop their hypothesis, and what they are doing to track down this elusive planet. W. M. Keck Observatory wishes to offer our deepest gratitude to our Astronomy Talk Series sponsors, Rob and Terry Ryan.