Dust cloud

A dust cloud was a large accumulation of dust or debris which could obscure one's vision. The planet Krikkit was surrounded by a dust cloud so thick that the native Krikkitas believed it to be the only location in the universe. (PROSE: Doctor Who and the Krikkitmen)

After the Earth was struck by a large meteorite, a dust cloud enveloped the planet and blocked out the sun, dooming the dinosaurs to extinction. (AUDIO: The Adolescence of Time)

Smaller dust clouds could form on the surfaces of planets, such as on Lydar. (AUDIO: The Bomb)