Lecture by Professor Fran Bagenal, Co-investigator and Leader of the Plasma Teams for NASA’s New Horizons mission to Pluto and Juno mission to Jupiter, and Laboratory of Atmospheric and Space Physics, University of Colorado. A Sydney Ideas talk co-presented with Sydney SpaceNet at the University of Sydney, 22 September 2016. http://sydney.edu.au/sydney_ideas/lectures/2016/professor_fran_bagenal.shtml