NASA's Mars Global Surveyor shows variation of dust content with time showing the growth of a storm on Mars.

Variation of dust content with time shows the growth of a storm. Opacities range from 0.15 (violet) to 1.25 (red). Orbit 25 is 10-21-1997, orbit 51 is 11-27-1997, and orbit 53 is 11-30-1997.

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