Abstract
Plasmas have existed since the very first moments of the Universe. It is the stuff of stars. It fills the space between stars. It gives us the beautiful northern and southern aurorae. Our houses have plasma TV displays, plasma lights (fluorescent tubes). Everywhere we look, there is plasma. But we stand on solid earth and the solid state accounts for less than one percent of the total mass of the Universe. The rest is plasma, a hot ionised gas containing positive and negative charges (except, perhaps, for dark matter). By properly harnessing the plasma state we can make microchips for computers, we can make plasma engines (thrusters) to get to the planets and we can make fuel cells to take people just down to the shops. The discovery in Australia of a current-free electric double layer (a cliff of potential like a river waterfall which energise charged particles falling through them) in a laboratory plasma is the basis of a new space engine: the Australian Helicon Double Layer Thruster.

Biographical details
Christine Charles is Associate Professor at the Australian National University. She has a French Engineering degree in applied physics, a French Masters in materials science, a French PhD in plasma physics, a French Habilitation thesis in materials science and a Bachelor of Music degree in Jazz from the ANU. For the past twenty years, she has been working on expanding plasmas and their applications to electric propulsion, microelectronics and optoelectronics, astrophysical objects, and, more recently, to the development of fuel cells for the hydrogen economy. She is the inventor of the Helicon Double Layer Thruster, a new electrode-less magneto-plasma thruster, that has applications including satellite station keeping or interplanetary space travel. The thruster concept is based on her discovery in 1999 of the current-free double layer in an expanding radiofrequency plasma. She actively popularises her science on ABC Catalyst, Discovery Channel, radio and public lectures. She enjoys playing music, surfing, canoeing, cycling and bushwalking.

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The Australian Institute of Physics International Women in Physics Lecture Series was instituted to celebrate the contribution of women to advances in physics. Under this scheme, a woman who has made a significant contribution in a field of physics will give a series of lectures around Australia, including a Public Lecture arranged by each participating branch of the AIP. The Lecture will be of interest to a non-specialist physics audience and is expected to increase awareness among students and their families of the possibilities offered by continuing to study physics.