Transient Atmospheric Phenomena

Early telescopic observers noted instances in which Martian surface features were temporarily obscured. They observed both white and yellow obscurations that were correctly interpreted as due to condensed gas and dust, respectively. Telescopic observers also noted periodic disappearances of all dark markings, usually around southern summer. Again they were correctly interpreted as the result of global dust storms. Spacecraft observations have confirmed that hazes, clouds, and fogs commonly veil the surface.

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