Why do some Martian dust storms become planet-wide?
Quick Answer
Mars has very fine, dry dust and a thin atmosphere that can still move it over huge distances once storms start. Seasonal heating can intensify winds until dust spreads across the whole planet.
The Full Story
Martian dust storms can grow so large because the dust particles are extremely fine and easy to lift, and Mars has a dry, dusty surface with few obstacles to stop wind. Even though the atmosphere is thin, winds can still mobilize dust over enormous areas. Seasonal heating, especially when Mars is closer to the Sun in some parts of its orbit, can help storms expand. Some storms become global and can last for weeks, reducing sunlight for landers and orbiters below.
Key Facts
YouTube Angle
Suggested video title for this topic:
"How a thin atmosphere can still blanket an entire planet in dust."