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A huge outback dust storm – 500 km (310 mi) wide by 1,000 km (620 mi) long – swept across eastern Australia and blanketed Sydney on Wednesday, September 23rd, disrupting flights and ground transportation and forcing people indoors for shelter from the hazardous air, gale-force winds, and in some places hailstorms. Those few who ventured outside, especially at dawn, were greeted by a Martian sky, familiar landmarks blotted out by the heavy red dust blowing by. Collected here are a few photos of the worst dust storm Sydney has seen in 70 years, three of which you can click to see a before/after fade effect. (26 photos total)

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A woman takes a photograph with the Sydney Opera House shrouded in dust behind her on September 23, 2009. (GREG WOOD/AFP/Getty Images) #