Glossary of Terms:

• L_s
  Solar longitude, a measure of where Mars is in its year. Mars has 4 seasons, much like Earth, in the following groups: 00° to 89° - Spring 90° to 179° - Summer 180° to 269° - Autumn 270° to 359° - Winter.
  
• Albedo
  A measure of the reflectivity of light from the surface of Mars. A completely non-reflective (black) surface has an albedo of 0, while a highly-reflective (bright white) surface has an albedo of 1.
  
• Sublimation
  When a solid skips the liquid state and becomes a gas.
  
• Equinox
  When the sun is closest to the equator. Spring equinox - L_s 0°, Autumn equinox - L_s 180°. See also Solstice.
  
• Solstice
  When the sun is furthest from the equator. Summer solstice - L_s 90°, Winter solstice - L_s 270°. See also Equinox.
  
• IR
  Infrared light, long wavelength.
  
• Vis
  Visible light, what you and I can see.
  
• False-Color
  Color used to denote a scale (or range) of values at a point.
  
• CO₂ Ice
  Condensed Carbon-Dioxide ice. Forms on Mars at about -128 C°. This is lower than Earth because of the lower barametric pressure.
  
• Bolometer
  A radiant energy thermometer made of a thin wire. The electrical characteristics change as a function of radiant energy impacting it.
  
• Condesates
  Atmospheric moisture that has condensed, the resultant particles of condensation. On Mars, much of the atmosphere is CO₂; as expected, much of the condensates are dry ice.
  
• Regolith
  Greek for “Blanket Rock,” this is simply the region of soil that covers a denser subsoil. On Mars, frozen water may be found in the top meter of regolith (soil).