| To get to the Moon she expended only about 60 kilograms of xenon propellant. |
| The light source of the system is a high-pressure xenon arc lamp with a fast-scanning polychromator. |
| Along with helium, neon, argon, krypton, and xenon, it is classed as an inert gas within group 0 of the periodic table. |
| A cathode emits a stream of electrons that collides with neutral atoms of xenon, a gaseous element, in a chamber. |
| The momentary high voltage on the metal plate provides the necessary energy to ionize the xenon gas, making the gas conductive. |
| In deep space, the propellant can be small amounts of ionized xenon gas, accelerated to enormous speeds within a new kind of engine. |
