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