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