Aldrin Cycler: A large habitat traveling in a permanent orbit around the sun that crosses the orbits of Earth and Mars every 26 months. It is used as a “space hotel” for colonists on their way to Mars, both reducing time in transit, while increasing comfort and safety. It is named after its original inventor, twentieth century Lunar astronaut, Buzz Aldrin.

EVA: Shorthand for “Extra Vehicular Activity”, a term coined in the earliest days of human space flight that has lasted to the present day and is now used to describe whenever one goes outside a pressurized habitat.

Regolith: Term that describes the rocks and other inorganic material that make up the surface layer of some planets and moons.

Sol: One full rotational period of Mars or one Mars day. It is 24 hours 39 minutes in duration when measured in standard Earth time units.

Specific impulse: A term applying to the amount of propulsive energy generated by a rocket engine. The greater the specific impulse generated the more kinetic energy that can be imparted to a rocket and its payload.

Verniers: Small rocket engines located at strategic points on a spacecraft that are used to change its orientation or attitude relative to its direction of motion.

WC: Short for “Water Closet.” This is an old term, once widely used and recognized in Europe, referring to a restroom or bathroom. It fell into disuse during the late twentieth century and then re-emerged and came into common use again among Mars and Lunar colonists, many of whom had European backgrounds.

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