Keith welcomes back Andrew Ingersoll, Professor of Planetary Science, Division of Geological & Planetary Sciences, California Institute of Technology. Ingersoll explains how the planets formed in the early stages of the solar system. He also talks about geysers on the Saturnian moon Enceladus, a hexagonal storm on one of Saturn's poles, methane lakes on Titan, and unique ice caps on Mars.
Aired June 2, 2013.
