Why are there such huge dust storms on Mars?
Quick Answer
Mars has a thin, dry atmosphere that lifts dust easily, and once storms start they can spread around the planet. Global dust storms can last for weeks or months.
The Full Story
Mars's atmosphere is only about 1% as dense as Earth's, so fine dust can be picked up by winds more easily than on our planet. The dust also absorbs sunlight and warms the air, which can strengthen circulation and keep the storm going. Because the atmosphere is so dry and there is no rain to wash dust out, storms can persist for a long time. Some Mars storms grow large enough to cover the whole planet, a phenomenon observed several times by spacecraft and telescopes. These storms can dim the Sun and threaten solar-powered missions.
Key Facts
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