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Because the air on Mars is so thin, it's possible to get tremendously fast winds there, which kicks up enormous dust storms. When the first Viking Lander was scheduled to land on Mars, on July 4, 1976 (just in time for the Bicentennial of the US), a planet-wide dust storm had completely obscured the planet, and the landing had to be postponed for 2 weeks. The Viking Lander actually landed on July 20, 1976, the anniversary of the first Apollo landing on the Moon.

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15y ago

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